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extensive having great reach or extension. [3 definitions]
extensor a muscle that serves to stretch or straighten part of the body, esp. an arm or a leg.
extent the degree, amount, space, or distance that something reaches or covers. [3 definitions]
extenuate to reduce the magnitude or seriousness of (a fault or offense) by offering partial excuses.
exterior on or related to the outside or outer side. [5 definitions]
exterior angle any of the four angles formed outside of two parallel lines where they are intersected by a transverse line. (Cf. interior angle.) [2 definitions]
exteriorize to make external or exterior.
exterminate to get rid of by totally destroying; eradicate; wipe out.
exterminator someone or something that exterminates. [2 definitions]
external of the outside or outer part; being outside. [6 definitions]
external-combustion engine an engine in which the combustion of fuel occurs outside the cylinder or turbine, as in a steam engine.
external degree a college or university diploma awarded to a nonmatriculated student who has earned credit through work experience, nonacademic training, independent study, or the passing of proficiency examinations.
externalize to manifest or make external. [2 definitions]
external respiration the exchange of carbon dioxide and oxygen across external or respiratory surfaces, such as gills, in multicellular organisms.
extinct no longer existing, as an animal species. [3 definitions]
extinction the act or process of becoming or making extinct, or of being ended or putting an end to. [2 definitions]
extinguish to put out (a fire, flame, or light). [4 definitions]
extinguishable combined form of extinguish.
extinguisher one that extinguishes, esp. a fire extinguisher.
extirpate to get rid of completely, as if by pulling up the roots; root out. [3 definitions]
extol to speak of with high praise or enthusiasm.