英语词汇extensor的起源、历史背景-英语词源词典

词汇	extensor
词源	extensor n. "muscle which serves to straighten or extend any part of the body," 1713, short for medical Latin musculus extensor, from Late Latin extensor "stretcher," agent noun from Latin extendere "spread out, spread" (see extend). Entries linking to extensor extend v. early 14c., "to value, assess," from Anglo-French estendre (late 13c.), Old French estendre "stretch out, extend, increase," transitive and intransitive (Modern French étendre), from Latin extendere "stretch out, spread out; increase, enlarge, prolong, continue," from ex "out" (see ex-) + tendere "to stretch," from PIE root *ten- "to stretch." Original sense in English is obsolete. From late 14c. as "lengthen or extend in time," also "straighten" (an arm, wing. etc.). Meaning "make longer and/or broader in space" is from early 15c., as is intransitive sense of "cover an area, have a certain extent in space;" sense of "expand, grow distended" is from 1753. Related: Extended; extending. updated on September 28, 2014
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extensor n.