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Glossary · Nouns · A

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TermTypeDefinitionClassificationsUpdated
Aciculanouna needlelike part or structure of a plant or animal or crystalverifiedMay 18, 2026
Acid AnhydridesnounMWEorganic compounds that react with water to form an acidverifiedMay 18, 2026
Acid DyenounMWEdye in which the chromophore is part of a negative ionverifiedMay 18, 2026
Acid HeadnounMWEsomeone who takes LSDverifiedMay 18, 2026
Acid HydrogennounMWEa hydrogen atom in an acid that forms a positive ion when the acid dissociatesverifiedMay 18, 2026
Acid PrecipitationnounMWErain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with waterverifiedMay 18, 2026
Acid RainnounMWErain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with waterverifiedMay 18, 2026
Acid RocknounMWEa musical style that emerged in the 1960sverifiedMay 18, 2026
Acid TestnounMWEa rigorous or crucial appraisalverifiedMay 18, 2026
Acid ValuenounMWEthe amount of free acid present in fat as measured by the milligrams of potassium hydroxide needed to neutralize itverifiedMay 18, 2026
Acid-Base BalancenounMWE(physiology) the normal equilibrium between acids and alkalis in the bodyverifiedMay 18, 2026
Acid-Base EquilibriumnounMWEthe normal equilibrium between acids and alkalis in the body, from physiologyverifiedMay 18, 2026
Acidemianouna blood disorder characterized by an increased concentration of hydrogen ions in the blood (which falls below 7 on the pH scale)verifiedMay 18, 2026
Acidic HydrogennounMWEa hydrogen atom in an acid that forms a positive ion when the acid dissociatesverifiedMay 18, 2026
Acidificationnounthe process of becoming acid or being converted into an acidverifiedMay 18, 2026
Acidimetrynounvolumetric analysis using standard solutions of acids to measure the amount of a base presentverifiedMay 18, 2026
Aciditynounthe taste experience when something acidic is taken into the mouthverifiedMay 18, 2026
Acidophilnounan organism that thrives in a relatively acid environmentverifiedMay 18, 2026
Acidophilenounan organism that thrives in a relatively acid environmentverifiedMay 18, 2026
Acidophilusnouna bacterium that is used to make yogurt and to supplement probioticsverifiedMay 18, 2026
Acidophilus MilknounMWEmilk fermented by bacteriaverifiedMay 18, 2026
Acidosisnounabnormally high acidity (excess hydrogen-ion concentration) of the blood and other body tissuesverifiedMay 18, 2026
Acidulousnessnounthe taste experience when something acidic is taken into the mouthverifiedMay 18, 2026
Acinusnounone of the small drupes making up an aggregate or multiple fruit like a blackberryverifiedMay 18, 2026
ACK PiggybackingnounMWEACK piggybacking is the practice of sending an ACK inside another packet going to the same destination.ThreatMay 9, 2026
Ack-Acknounartillery designed to shoot upward at airplanesverifiedMay 18, 2026
Ack-Ack GunnounMWEartillery designed to shoot upward at airplanesverifiedMay 18, 2026
Ackeenounred pear-shaped tropical fruit with poisonous seedsverifiedMay 18, 2026
Acknowledgementnouna short note recognizing a source of information or of a quoted passageverifiedMay 18, 2026
Acknowledgmentnouna short note recognizing a source of information or of a quoted passageverifiedMay 18, 2026
Aclinic LinenounMWEan imaginary line paralleling the equator where a magnetic needle has no dipverifiedMay 18, 2026
Acmenounthe highest level or degree attainableverifiedMay 18, 2026
Acnenounan inflammatory disease involving the sebaceous glands of the skinverifiedMay 18, 2026
Acne RosaceanounMWEa skin disease of adults, more often women, in which blood vessels of the face enlarge resulting in a flushed appearanceverifiedMay 18, 2026
Acne VulgarisnounMWEthe most common form of acneverifiedMay 18, 2026
Acolytenounsomeone who assists a priest or minister in a liturgical serviceverifiedMay 18, 2026
Aconitenounany of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowersverifiedMay 18, 2026
Acoreanounabsence of the pupil in an eyeverifiedMay 18, 2026
Acornnounfruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped baseverifiedMay 18, 2026
Acorn BarnaclenounMWEbarnacle that attaches to rocks especially in intertidal zonesverifiedMay 18, 2026
Acorn CupnounMWEcup-shaped structure of hardened bracts at the base of an acornverifiedMay 18, 2026
Acorn SquashnounMWEsquash plant bearing small acorn-shaped fruits having yellow flesh and dark green or yellow rind with longitudinal ridgesverifiedMay 18, 2026
Acorn TubenounMWEa small vacuum tubeverifiedMay 18, 2026
Acousmanounillusory auditory perception of strange nonverbal soundsverifiedMay 18, 2026
Acoustic AphasianounMWEan impairment in understanding spoken language that is not attributable to hearing lossverifiedMay 18, 2026
Acoustic BuoynounMWEa buoy that can be heard (at night)verifiedMay 18, 2026
Acoustic Delay LinenounMWEa delay line based on the time of propagation of sound wavesverifiedMay 18, 2026
Acoustic DevicenounMWEa device for amplifying or transmitting soundverifiedMay 18, 2026
Acoustic GramophonenounMWEan antique record playerverifiedMay 18, 2026
Acoustic GuitarnounMWEsound is not amplified by electrical meansverifiedMay 18, 2026
Acoustic ImpedancenounMWEopposition to the flow of sound through a surfaceverifiedMay 18, 2026
Acoustic MeatusnounMWEeither of the passages in the outer ear from the auricle to the tympanic membraneverifiedMay 18, 2026
Acoustic ModemnounMWEa modem that converts electrical signals to telephone tones and back againverifiedMay 18, 2026
Acoustic NervenounMWEa composite sensory nerve supplying the hair cells of the vestibular organ and the hair cells of the cochleaverifiedMay 18, 2026
Acoustic PhenomenonnounMWEa physical phenomenon associated with the production or transmission of soundverifiedMay 18, 2026
Acoustic PowernounMWEthe physical intensity of soundverifiedMay 18, 2026
Acoustic ProjectionnounMWEthe acoustic phenomenon that gives sound a penetrating qualityverifiedMay 18, 2026
Acoustic Radiation PressurenounMWE(acoustics) the pressure exerted on a surface normal to the direction of propagation of a sound waveverifiedMay 18, 2026
Acoustic ReactancenounMWEopposition to the flow of sound through a surfaceverifiedMay 18, 2026
Acoustic ResistancenounMWEopposition to the flow of sound through a surfaceverifiedMay 18, 2026
Acoustic SpectrumnounMWEthe distribution of energy as a function of frequency for a particular sound sourceverifiedMay 18, 2026
Acoustic StoragenounMWEa storage device consisting of acoustic delay linesverifiedMay 18, 2026
Acoustic WavenounMWE(acoustics) a wave that transmits soundverifiedMay 18, 2026
Acousticiannouna physicist who specializes in acousticsverifiedMay 18, 2026
Acousticophobianouna morbid fear of sounds including your own voiceverifiedMay 18, 2026
Acquaintancenounpersonal knowledge or information about someone or somethingverifiedMay 18, 2026
Acquaintanceshipnouna relationship less intimate than friendshipverifiedMay 18, 2026
Acquiescencenounagreement with a statement or proposal to do somethingverifiedMay 18, 2026
Acquired HemochromatosisnounMWEhemochromatosis resulting from repeated transfusions or from excessive intake of foods containing ironverifiedMay 18, 2026
Acquired Immune Deficiency SyndromenounMWEa serious (often fatal) disease of the immune system transmitted through blood products especially by sexual contact or contaminated needlesverifiedMay 18, 2026
Acquired ImmunitynounMWEimmunity to a particular disease that is not innate but has been acquired during lifeverifiedMay 18, 2026
Acquired ReflexnounMWEan acquired response that is under the control of (conditional on the occurrence of) a stimulusverifiedMay 18, 2026
Acquired TastenounMWEa preference that is only acquired after considerable experienceverifiedMay 18, 2026
Acquirementnounan ability that has been acquired by trainingverifiedMay 18, 2026
Acquirernouna corporation gaining financial control over another corporation or financial institution through a payment in cash or an exchange of stockverifiedMay 18, 2026
Acquirer FeenounMWEFee paid to the acquirer of the merchant sales draft. The acquirer of the sales draft collects a merchant discount fee (or processing fee) from the merchant for the costs associated with processing the transaction.RequirementRegulatedPCIMay 9, 2026
AcquiringnounverifiedMay 15, 2026
Acquiring Bank and AcquirernounMWESee Merchant acquirer.OrganizationRegulatedPCIMay 9, 2026
acquisitionnounThe purpose of this function is to manage the act of contracting, assuming, or acquiring possession of something.ProcessMay 9, 2026
Acquisition AgreementnounMWEcontract governing the merger of two or more companiesverifiedMay 18, 2026
Acquisitivenessnounstrong desire to acquire and possessverifiedMay 18, 2026
Acquittalnouna judgment of not guiltyverifiedMay 18, 2026
Acquittancenouna legal document evidencing the discharge of a debt or obligationverifiedMay 18, 2026
Acre InchnounMWEone twelfth of an acre-footverifiedMay 18, 2026
Acre-Footnounthe volume of water that would cover 1 acre to a depth of 1 footverifiedMay 18, 2026
Acreagenounan area of ground used for some particular purpose such as building or farmingverifiedMay 18, 2026
Acresnounextensive landed property (especially in the country) retained by the owner for his own useverifiedMay 18, 2026
Acrididnoungrasshopper with short antennaeverifiedMay 18, 2026
Acriditynounthe quality of being sharply disagreeable in language or toneverifiedMay 18, 2026
Acridnessnounthe quality of being sharply disagreeable in language or toneverifiedMay 18, 2026
Acrimonynouna rough and bitter mannerverifiedMay 18, 2026
Acroanaesthesianounloss of sensation in the extremitiesverifiedMay 18, 2026
Acroanesthesianounloss of sensation in the extremitiesverifiedMay 18, 2026
Acrobatnounan athlete who performs acts requiring skill and agility and coordinationverifiedMay 18, 2026
Acrobatic FeatnounMWEa stunt performed by an acrobatverifiedMay 18, 2026
Acrobatic StuntnounMWEa stunt performed by an acrobatverifiedMay 18, 2026
Acrobaticsnounthe performance of stunts while in flight in an aircraftverifiedMay 18, 2026
Acrocarpnouna moss in which the main axis is terminated by the archegonium (and hence the capsule)verifiedMay 18, 2026
Acrocarpous MossnounMWEa moss in which the main axis is terminated by the archegonium (and hence the capsule)verifiedMay 18, 2026
Acrocentric ChromosomenounMWEa chromosome with the centromere near one end so that one chromosomal arm is short and one is longverifiedMay 18, 2026