Hypertext Webster Gateway: "filly"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Filly \Fil"ly\, n.; pl. {Fillies}. [Cf. Icel. fylia, fr. foli
foal. See {Foal}.]
1. (Zo["o]l.) A female foal or colt; a young mare. Cf.
{Colt}, {Foal}.
Neighing in likeness of a filly foal. --Shak.
2. A lively, spirited young girl. [Colloq.] --Addison.
From WordNet (r) 1.7 (wn)
filly
n : a young female horse under the age of four
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