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Glossary · Nouns · T

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TermTypeDefinitionClassificationsUpdated
Thistlenounany of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leavesverifiedMay 18, 2026
Thistledownnounpappus of a thistle consisting of silky featherlike hairs attached to the seed-like fruit of a thistleverifiedMay 18, 2026
Tholenouna holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowingverifiedMay 18, 2026
Tholepinnouna holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowingverifiedMay 18, 2026
Thongnouna backless sandal held to the foot by a strip of fabric between the big toe and the second toe; also known as flip-flopsverifiedMay 18, 2026
Thoracentesisnounremoval of fluid from the chest by centesis for diagnostic or therapeutic purposesverifiedMay 18, 2026
Thoracic ActinomycosisnounMWEa serious form of actinomycosis that affects the chestverifiedMay 18, 2026
Thoracic AortanounMWEa branch of the descending aortaverifiedMay 18, 2026
Thoracic CavitynounMWEthe cavity in the vertebrate body enclosed by the ribs between the diaphragm and the neck and containing the lungs and heartverifiedMay 18, 2026
Thoracic DuctnounMWEthe major duct of the lymphatic systemverifiedMay 18, 2026
Thoracic MedicinenounMWEthe branch of medicine that deals with the diagnosis and treatment of diseases of the chestverifiedMay 18, 2026
Thoracic NervenounMWEany of twelve pairs of spinal nerves emerging from the thoracic region of the spinal cordverifiedMay 18, 2026
Thoracic Outlet SyndromenounMWEtingling sensations in the fingersverifiedMay 18, 2026
Thoracic VeinnounMWEveins that drain the thoracic wallsverifiedMay 18, 2026
Thoracic VertebranounMWEone of 12 vertebrae in the human vertebral columnverifiedMay 18, 2026
Thoracocentesisnounremoval of fluid from the chest by centesis for diagnostic or therapeutic purposesverifiedMay 18, 2026
Thoracoepigastric VeinnounMWEa vein arising from the region of the superficial epigastric vein and opening into the axillary vein or thoracic veinverifiedMay 18, 2026
Thoracotomynounsurgical incision into the chest walls opening up the pleural cavityverifiedMay 18, 2026
Thoraxnounthe part of the human torso between the neck and the diaphragm or the corresponding part in other vertebratesverifiedMay 18, 2026
Thoritenouna radioactive mineral consisting of thorium silicateverifiedMay 18, 2026
Thoriumnouna soft silvery-white tetravalent radioactive metallic elementverifiedMay 18, 2026
Thorium-228nounradioactive isotope of thorium with mass number 228verifiedMay 18, 2026
Thornnouna small sharp-pointed tip resembling a spike on a stem or leafverifiedMay 18, 2026
Thornbillnounany of various South American hummingbirds with a sharp pointed billverifiedMay 18, 2026
Thorninessnounthe quality of being covered with prickly thorns or spinesverifiedMay 18, 2026
Thorny AmaranthnounMWEerect annual of tropical central Asia and Africa having a pair of divergent spines at most leaf nodesverifiedMay 18, 2026
Thorny SkatenounMWEcold-water bottom fish with spines on the backverifiedMay 18, 2026
Thorough BassnounMWEa bass part written out in full and accompanied by numbers to indicate the chords to be playedverifiedMay 18, 2026
Thoroughbred RacenounMWEa race between thoroughbred horsesverifiedMay 18, 2026
Thoroughbred RacingnounMWEthe sport of racing thoroughbred horsesverifiedMay 18, 2026
Thoroughfarenouna public road from one place to anotherverifiedMay 18, 2026
thoroughnessnounConscientiousness in performing all aspects of a task.MetricMay 12, 2026
Thoroughwortnounperennial herb of southeastern United States having white-rayed flower headsverifiedMay 18, 2026
Thortveititenouna mineral consisting of scandium yttrium silicateverifiedMay 18, 2026
Thounounthe cardinal number that is the product of 10 and 100verifiedMay 18, 2026
Thoughtnouna personal belief or judgment that is not founded on proof or certaintyverifiedMay 18, 2026
Thought ProcessnounMWEthe way in which one thinks through an idea, often from conception to completion verifiedMay 18, 2026
Thought TransferencenounMWEapparent communication from one mind to another without using sensory perceptionsverifiedMay 18, 2026
Thought-Readernouna magician who seems to discern the thoughts of another person (usually by clever signals from an accomplice)verifiedMay 18, 2026
Thoughtfulnessnounthe trait of thinking carefully before actingverifiedMay 18, 2026
Thoughtlessnessnounthe quality of failing to be considerate of othersverifiedMay 18, 2026
Thraldomnounthe state of being under the control of another personverifiedMay 18, 2026
Thrallnounthe state of being under the control of another personverifiedMay 18, 2026
Thralldomnounthe state of being under the control of another personverifiedMay 18, 2026
Thrashernounlarge pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feedverifiedMay 18, 2026
Thrashingnounthe act of inflicting corporal punishment with repeated blowsverifiedMay 18, 2026
Thread BlightnounMWEa disease of tropical woody plants, like cacao or tea or citrusverifiedMay 18, 2026
Thread MakernounMWEsomeone who spins (who twists fibers into threads)verifiedMay 18, 2026
Threadernouna blunt needle for threading ribbon through loopsverifiedMay 18, 2026
Threadfinnounmullet-like tropical marine fishes having pectoral fins with long threadlike raysverifiedMay 18, 2026
Threadfishnounfish having greatly elongated front rays on dorsal and anal finsverifiedMay 18, 2026
Threadleaf GroundselnounMWEbluish-green bushy leafy plant covered with close white wool and bearing branched clusters of yellow flower headsverifiedMay 18, 2026
Threadwormnounsmall threadlike worm infesting human intestines and rectum especially in childrenverifiedMay 18, 2026
threatnounAny circumstance or event with the potential to adversely impact organizational operations (including mission, functions, image, or reputation), organizational assets, or individuals through an information system via unauthorized access, destruction, disclosure, modification of information, and/or denial of service. Also, the potential for a threat-source to successfully exploit a particular information system vulnerability.ThreatMay 12, 2026
Threat agentnounMWEMethods and things used to exploit a vulnerability Scope Note: Examples include determination, capability, motive and resources.ThreatMay 9, 2026
Threat analysisnounMWEThe examination of threat sources against system vulnerabilities to determine the threats for a particular system in a particular operational environment.ProcessMay 9, 2026
Threat and Vulnerability Management processnounMWEA process that includes vulnerability assessments, vulnerability scanning, penetration testing. Also included in the process is the cataloging of the assets that are in scope, assigning value and importance to those resources, and mitigating or eliminating any vulnerabilities discovered during the process.VulnerabilityRestrictedMay 12, 2026
threat assessmentnounMWEProcess of formally evaluating the degree of threat to an information system or enterprise and describing the nature of the threat.ProcessMay 9, 2026
Threat eventnounMWEAn event or situation that has the potential for causing undesirable consequences or impact.EventMay 9, 2026
threat informationnounMWEInformation about a potential source of danger or undesirable event.ThreatInternalMay 12, 2026
threat information sharingnounMWEThe act of providing threat information between two or more parties for the mutual benefit to use such information to mitigate risks.ProcessInternalMay 12, 2026
Threat intelligencenounMWEThe acquisition and analysis of information to identify, track, and predict cyber capabilities, intentions, and activities that offer courses of action to enhance decision-making.CapabilityMay 9, 2026
threat intelligence servicenounMWEA service that provides threat intelligence so that organizations can mitigate threats and remediate vulnerabilities.CapabilityMay 12, 2026
Threat ModelnounMWEA threat model is used to describe a given threat and the harm it could to do a system if it has a vulnerability.ArtifactMay 12, 2026
Threat MonitoringnounMWEAnalysis, assessment, and review of audit trails and other information collected for the purpose of searching out system events that may constitute violations of system security.CapabilityMay 9, 2026
threat monitoring processnounMWEA particular series of actions or steps to analyze, assess and review audit trails and other information collected for the purpose of searching out system events that may constitute violations of system security.ProcessInternalMay 9, 2026
Threat ScenarionounMWEA set of discrete threat events, associated with a specific threat source or multiple threat sources, partially ordered in time.ThreatMay 9, 2026
Threat ShiftingnounMWEResponse from adversaries to perceived safeguards and/or countermeasures (i.e., security controls), in which the adversaries change some characteristic of their intent to do harm in order to avoid and/or overcome those safeguards/countermeasures.ThreatMay 9, 2026
Threat SourcenounMWEThe intent and method targeted at the intentional exploitation of a vulnerability or a situation and method that may accidentally trigger a vulnerability. Synonymous with Threat Agent.ThreatMay 9, 2026
Threat vectornounMWEThe path or route used by the adversary to gain access to the targetThreatMay 9, 2026
Threatened AbortionnounMWEthe appearance of symptoms that signal the impending loss of the products of conceptionverifiedMay 18, 2026
threenounThe Roman numeral of the cardinal number three.verifiedMay 12, 2026
Three Lines of DefensenounMWEMost financial institutions follow a three-lines-of-defense model, which separates front line groups, which are generally accountable for business risks (the First Line), from other risk oversight and independent challenge groups (the Second Line) and assurance (the Third Line)FrameworkMay 18, 2026
Three-Baggernouna base hit at which the batter stops safely at third baseverifiedMay 18, 2026
Three-Banded ArmadillonounMWESouth American armadillo with three bands of bony platesverifiedMay 18, 2026
Three-Base HitnounMWEa base hit at which the batter stops safely at third baseverifiedMay 18, 2026
Three-Card MontenounMWEa gambling card game of Spanish originverifiedMay 18, 2026
Three-Centered ArchnounMWEa round arch whose inner curve is drawn with circles having three centersverifiedMay 18, 2026
Three-Cornered LeeknounMWEEuropean leek naturalized in Great BritainverifiedMay 18, 2026
Three-Day EventnounMWEan equestrian competitionverifiedMay 18, 2026
Three-Day MeaslesnounMWEa contagious viral disease that is a milder form of measles lasting three or four daysverifiedMay 18, 2026
Three-Deckernounmade with three slices of usually toasted breadverifiedMay 18, 2026
Three-Dimensional FigurenounMWEa three-dimensional shapeverifiedMay 18, 2026
Three-Dimensional RadarnounMWEradar that will report altitude as well as azimuth and distance of a targetverifiedMay 18, 2026
Three-Dimensionalitynounthe property of having three dimensionsverifiedMay 18, 2026
Three-Fourthsnounthree of four equal partsverifiedMay 18, 2026
Three-Hitternouna game in which a pitcher allows the opposing team only 3 hitsverifiedMay 18, 2026
Three-Mile LimitnounMWEthe limit of a nation's territorial watersverifiedMay 18, 2026
Three-Piece SuitnounMWEa business suit consisting of a jacket and vest and trousersverifiedMay 18, 2026
Three-Point LandingnounMWEa landing in which all three wheels of the aircraft touch the ground at the same timeverifiedMay 18, 2026
Three-Point SwitchnounMWEan electric switch that has three terminalsverifiedMay 18, 2026
Three-Point TurnnounMWEthe act of turning a vehicle around in a limited space by moving in a series of back and forward arcsverifiedMay 18, 2026
Three-Quarter BindingnounMWEthe spine and much of the sides are a different material from the rest of the coververifiedMay 18, 2026
Three-Ring CircusnounMWEa circus with simultaneous performances in three ringsverifiedMay 18, 2026
Three-Spined SticklebacknounMWEof rivers and coastal regionsverifiedMay 18, 2026
Three-Toed SlothnounMWEa sloth that has three long claws on each forefoot and each hindfootverifiedMay 18, 2026
Three-Way CallingnounMWEa way of adding a third party to your conversation without the assistance of a telephone operatorverifiedMay 18, 2026
Three-Year-Old HorsenounMWEa racehorse that is three years oldverifiedMay 18, 2026
Threepencenounformer cupronickel coin of the United Kingdom equal to three penniesverifiedMay 18, 2026
Threesomenounthe cardinal number that is the sum of one and one and oneverifiedMay 18, 2026