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a combining form used in the names of units of measurement which are 10− 15 (one quadrillionth) smaller than the unit denoted by the base word.
denoting 10–15: femtometer, f

femto- pref.
One quadrillionth (10-15): femtovolt.



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  • Fen

    [fen] /fɛn/ noun 1. low land covered wholly or partially with water; boggy land; a marsh. 2. the Fens, a marshy region W and S of The Wash, in E England. [fen] /fɛn/ noun, plural fen. 1. an aluminum coin and monetary unit of the People’s Republic of China, the hundredth part of a yuan […]

  • Fenagle

    [fi-ney-guh l] /fɪˈneɪ gəl/ verb (used with or without object), fenagled, fenagling. 1. . [fi-ney-guh l] /fɪˈneɪ gəl/ verb (used with object), finagled, finagling. 1. to trick, swindle, or cheat (a person) (often followed by out of): He finagled the backers out of a fortune. 2. to get or achieve (something) by guile, trickery, or […]

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