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Glossary · Nouns · F

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TermTypeDefinitionClassificationsUpdated
F NumbernounMWEthe ratio of the focal length to the diameter of a (camera) lens systemverifiedMay 18, 2026
Fanounthe syllable naming the fourth (subdominant) note of the diatonic scale in solmizationverifiedMay 18, 2026
Fa LanounMWEmeaningless syllables in the refrain of a partsongverifiedMay 18, 2026
Fablenouna story about mythical or supernatural beings or eventsverifiedMay 18, 2026
Fabricnounartifact made by weaving or felting or knitting or crocheting natural or synthetic fibersverifiedMay 18, 2026
Fabricationnounthe act of constructing something (as a piece of machinery)verifiedMay 18, 2026
Fabricatornounsomeone who tells liesverifiedMay 18, 2026
Fabulistnouna person who tells or invents fablesverifiedMay 18, 2026
Facadenouna showy misrepresentation intended to conceal something unpleasantverifiedMay 18, 2026
Face AnglenounMWEthe angle formed by two edges of a polyhedral angleverifiedMay 18, 2026
Face CardnounMWEone of the twelve cards in a deck bearing a picture of a faceverifiedMay 18, 2026
Face ClothnounMWEbath linen consisting of a piece of cloth used to wash the face and bodyverifiedMay 18, 2026
Face CreamnounMWEa cream used cosmetically for softening and cleaning the skinverifiedMay 18, 2026
Face FungusnounMWEthe hair growing on the lower part of a man's faceverifiedMay 18, 2026
Face GuardnounMWEface mask consisting of a strong wire mesh on the front of football helmetsverifiedMay 18, 2026
Face LiftnounMWEa renovation that improves the outward appearance (as of a building) but usually does not involve major changesverifiedMay 18, 2026
Face LiftingnounMWEa renovation that improves the outward appearance (as of a building) but usually does not involve major changesverifiedMay 18, 2026
Face MasknounMWEmask that provides a protective covering for the face in such sports as baseball or football or hockeyverifiedMay 18, 2026
Face PacknounMWEa cream that cleanses and tones the skinverifiedMay 18, 2026
Face PowdernounMWEcosmetic powder for the faceverifiedMay 18, 2026
Face RecognitionnounMWEbiometric identification by scanning a person's face and matching it against a library of known facesverifiedMay 18, 2026
Face SavernounMWEan act that avoids a loss of face (of dignity or prestige)verifiedMay 18, 2026
Face SavingnounMWEan act that avoids a loss of face (of dignity or prestige)verifiedMay 18, 2026
Face SoapnounMWEsoap used as a toiletryverifiedMay 18, 2026
Face TimenounMWEwork time spent at the location of or in the presence of other peopleverifiedMay 18, 2026
Face TowelnounMWEa small towel used to dry the hands or faceverifiedMay 18, 2026
Face ValuenounMWEthe value of a security that is set by the company issuing itverifiedMay 18, 2026
Face VeilnounMWEa piece of more-or-less transparent material that covers the faceverifiedMay 18, 2026
Face-Amount Certificate CompanynounMWEa regulated investment company that pays a stated amount to certificate holders on a stated maturity dateverifiedMay 18, 2026
Face-Offnoun(ice hockey) the method of starting playverifiedMay 18, 2026
Faceplatenouna protective covering for the front of a machine or device (as a door lock or computer component)verifiedMay 18, 2026
Facernoun(a dated Briticism) a serious difficulty with which one is suddenly facedverifiedMay 18, 2026
Facetnouna smooth surface (as of a bone or cut gemstone)verifiedMay 18, 2026
Facet PlanenounMWEthe plane of a facet of an object (as of a cube)verifiedMay 18, 2026
Facetiousnessnounplayful humorverifiedMay 18, 2026
Facianouna sheet or band of fibrous connective tissue separating or binding together muscles and organs etcverifiedMay 18, 2026
Facial ArterynounMWEan artery that originates in the external carotid and gives off branches that supply the neck and faceverifiedMay 18, 2026
Facial ExpressionnounMWEa gesture executed with the facial musclesverifiedMay 18, 2026
Facial GesturenounMWEa gesture executed with the facial musclesverifiedMay 18, 2026
Facial HairnounMWEhair on the face (especially on the face of a man)verifiedMay 18, 2026
Facial IndexnounMWEthe ratio (in percent) of the maximum width to the maximum height of the faceverifiedMay 18, 2026
Facial MusclenounMWEany of the skeletal muscles of the faceverifiedMay 18, 2026
Facial NervenounMWEcranial nerve that supplies facial musclesverifiedMay 18, 2026
Facial ProfilingnounMWEAny form of automated processing of personal data to evaluate certain personal aspects relating to a natural personverifiedMay 18, 2026
Facial RecognitionnounMWEbiometric identification by scanning a person's face and matching it against a library of known facesverifiedMay 18, 2026
Facial Recognition (FR)nounMWEFace recognition algorithms, however, have no built-in notion of a particular person. They are not built to identify particular people; instead they include a face detector followed by a feature extraction algorithm that converts one or more images of a person into a vector of values that relate to the identity of the person. The extractor typically consists of a neural network that has been trained on ID-labeled images available to the developer. In operations, they act as generic extractors of identity-related information from photos of persons they have usually never seen before. Recognition proceeds as a differential operator: Algorithms compare two feature vectors and emit a similarity score. This is a vendor-defined numeric value expressing how similar the parent faces are. It is compared to a threshold value to decide whether two samples are from, or represent, the same person or not. Thus, recognition is mediated by persistent identity information stored in a feature vector (or “template”).CapabilityRegulatedPIIMay 18, 2026
Facial TissuenounMWEtissue paper suitable for use on the faceverifiedMay 18, 2026
Facial VeinnounMWEany of several veins draining the faceverifiedMay 18, 2026
Facilitationnoun(neurophysiology) phenomenon that occurs when two or more neural impulses that alone are not enough to trigger a response in a neuron combine to trigger an action potentialverifiedMay 18, 2026
Facilitatornounsomeone who makes progress easierverifiedMay 18, 2026
facilitynounA place, amenity, or piece of equipment provided for a particular purpose.PhysicalMay 9, 2026
Facingnouna lining applied to the edge of a garment for ornamentation or strengtheningverifiedMay 18, 2026
Facing PagesnounMWEtwo facing pages of a book or other publicationverifiedMay 18, 2026
Facsimile MachinenounMWEduplicator that transmits the copy by wire or radioverifiedMay 18, 2026
Factnouna statement or assertion of verified information about something that is the case or has happenedverifiedMay 18, 2026
Fact MoodnounMWEa mood (grammatically unmarked) that represents the act or state as an objective factverifiedMay 18, 2026
Factionnouna clique (often secret) that seeks power usually through intrigueverifiedMay 18, 2026
Factoidnouna brief (usually one sentence and usually trivial) news itemverifiedMay 18, 2026
Factor AnalysisnounMWEany of several methods for reducing correlational data to a smaller number of dimensions or factorsverifiedMay 18, 2026
Factor InounMWEa protein present in blood plasmaverifiedMay 18, 2026
Factor IInounMWEa protein in blood plasma that is the inactive precursor of thrombinverifiedMay 18, 2026
Factor IIInounMWEan enzyme liberated from blood platelets that converts prothrombin into thrombin as blood starts to clotverifiedMay 18, 2026
Factor IVnounMWEion of calciumverifiedMay 18, 2026
Factor IxnounMWEcoagulation factor whose absence is associated with hemophilia BverifiedMay 18, 2026
Factor of ProportionalitynounMWEthe constant value of the ratio of two proportional quantities x and yverifiedMay 18, 2026
Factor of SafetynounMWEthe ratio of the breaking stress of a structure to the estimated maximum stress in ordinary useverifiedMay 18, 2026
Factor VnounMWEa coagulation factorverifiedMay 18, 2026
Factor ViinounMWEa coagulation factor formed in the kidney under the influence of vitamin KverifiedMay 18, 2026
Factor ViiinounMWEa coagulation factor (trade name Hemofil) whose absence is associated with hemophilia AverifiedMay 18, 2026
Factor XnounMWEcoagulation factor that is converted to an enzyme that converts prothrombin to thrombin in a reaction that depends on calcium ions and other coagulation factorsverifiedMay 18, 2026
Factor XinounMWEcoagulation factor whose deficiency results in a hemorrhagic tendencyverifiedMay 18, 2026
Factor XiinounMWEcoagulation factor whose deficiency results in prolongation of clotting time of venous bloodverifiedMay 18, 2026
Factor XiiinounMWEin the clotting of blood thrombin catalyzes factor XIII into its active form (fibrinase) which causes fibrin to form a stable clotverifiedMay 18, 2026
Factoringnoun(mathematics) the resolution of an entity into factors such that when multiplied together they give the original entityverifiedMay 18, 2026
Factorisationnoun(mathematics) the resolution of an entity into factors such that when multiplied together they give the original entityverifiedMay 18, 2026
Factorizationnoun(mathematics) the resolution of an entity into factors such that when multiplied together they give the original entityverifiedMay 18, 2026
Factorynouna plant consisting of one or more buildings with facilities for manufacturingverifiedMay 18, 2026
Factory FarmnounMWEa large-scale farming enterpriseverifiedMay 18, 2026
Factory PricenounMWEprice charged for goods picked up at the factoryverifiedMay 18, 2026
Factory ShipnounMWEa whaling ship equipped to process whale products at seaverifiedMay 18, 2026
Factory WhistlenounMWEa whistle at a factory that is sounded to announce times for starting or stopping workverifiedMay 18, 2026
Factory WorkernounMWEa workman in a mill or factoryverifiedMay 18, 2026
Factotumnouna servant employed to do a variety of jobsverifiedMay 18, 2026
Facts of LifenounMWEthe sexual activity of conceiving and bearing offspringverifiedMay 18, 2026
Factualitynounthe quality of being actual or based on factverifiedMay 18, 2026
Factualnessnounthe quality of being actual or based on factverifiedMay 18, 2026
Faculanouna large bright spot on the sun's photosphere occurring most frequently in the vicinity of sunspotsverifiedMay 18, 2026
Facultynounone of the inherent cognitive or perceptual powers of the mindverifiedMay 18, 2026
Faculty MembernounMWEan educator who works at a college or universityverifiedMay 18, 2026
Fadnounan interest followed with exaggerated zealverifiedMay 18, 2026
Fad DietnounMWEa reducing diet that enjoys temporary popularityverifiedMay 18, 2026
Faddistnouna person who subscribes to a variety of fadsverifiedMay 18, 2026
Fadingnounweakening in force or intensityverifiedMay 18, 2026
Fading AwaynounMWEgradually diminishing in brightness or loudness or strengthverifiedMay 18, 2026
Fadonouna sad Portuguese folksongverifiedMay 18, 2026
Faecal MatternounMWEsolid excretory product evacuated from the bowelsverifiedMay 18, 2026
Faecal Occult TestnounMWEa test performed at home in which you collect specimens of your stool that are tested for traces of bloodverifiedMay 18, 2026
Faecalithnouna hard mass of fecal matterverifiedMay 18, 2026
Faecesnounsolid excretory product evacuated from the bowelsverifiedMay 18, 2026
Faerienouna small being, human in form, playful and having magical powersverifiedMay 18, 2026