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filly (n.)

c. 1400, filli, fyly, "a young mare, female colt or foal," possibly from Old Norse fylja, fem. of foli "foal," from Proto-Germanic *fuljo, from PIE *pulo- "young of an animal," suffixed form of root *pau- (1) "few, little." Slang sense of "lively young girl" is from 1610s.

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Definitions of filly

filly (n.)
a young female horse under the age of four;
From wordnet.princeton.edu