Filly

[fil-ee] /ˈfɪl i/

noun, plural fillies.
1.
a young female horse.
2.
Informal. a girl or young woman.
/ˈfɪlɪ/
noun (pl) -lies
1.
a female horse or pony under the age of four
2.
(informal, rare) a spirited girl or young woman
n.

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

noun

A girl; young woman

[1616+; fr French fille, ”girl”]

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