英语词汇protractor的起源、历史背景-英语词源词典

词汇	protractor
词源	protractor n. 1610s, "one who lengthens (an action)," Modern Latin agent noun from Latin protrahere "to draw forward" (see protraction). Medieval Latin protractor meant "one who calls or drags another into court." The surveying sense of "instrument for measuring and drawing angles on paper" is recorded from 1650s. As "muscle which serves to extend a limb or member," by 1861. Entries linking to protractor protraction n. mid-15c., protraccioun, "drawing or writing of numbers," from late Old French protraction (15c.) and directly from Late Latin protractionem (nominative protractio) "a drawing out or lengthening," noun of action from past-participle stem of Latin protrahere "to draw forward, draw out, bring forth;" figuratively "bring to light, reveal, expose," from pro "forward" (see pro-) + trahere "to draw" (see tract (n.1)). Meaning "act of drawing out or prolonging" is from 1530s. updated on December 27, 2020
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protractor n.