noun, plural fillies.
a young female horse.
Informal. a girl or young woman.

1400–50; late Middle English fyly < Old Norse fyla female foal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
filly (ˈfɪlɪ)
n , pl -lies
1.  a female horse or pony under the age of four
2.  informal, rare a spirited girl or young woman
[C15: from Old Norse fylja; related to Old High German fulihha; see foal]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1404, fyly, possibly from O.N. fylja, fem. of foli "foal" (see foal). Slang sense of "young girl" is from 1616.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Due to the multiple and severe lacerations and the extensive joint involvement the filly had a grave prognosis for recovery.
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