noun, plural fil·lies.

a young female horse.
Informal. a girl or young woman.

Origin of filly

1400–50; late Middle English fyly < Old Norse fyla female foal Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for filly

Contemporary Examples of filly

  • But on May 30, Jackson announced he would not enter his filly, claiming she “deserves a well-earned vacation.”

    The Daily Beast logo
    Can These Two Horses Save Racing?

    Sally Denton

    June 4, 2009

Historical Examples of filly

British Dictionary definitions for filly


noun plural -lies

a female horse or pony under the age of four
informal, rare a spirited girl or young woman

Word Origin for filly

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

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