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filly

[fil-ee]
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noun, plural fil·lies.
  1. a young female horse.
  2. Informal. a girl or young woman.

Origin of filly

1400–50; late Middle English fyly < Old Norse fyla female foal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for filly

filly

noun plural -lies
  1. a female horse or pony under the age of four
  2. informal, rare a spirited girl or young woman

Word Origin

C15: from Old Norse fylja; related to Old High German fulihha; see foal
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for filly

n.

c.1400, fyly, possibly from Old Norse fylja, fem. of foli "foal" (see foal (n.)). Slang sense of "young girl" is from 1610s.

Online Etymology Dictionary, © 2010 Douglas Harper