FILLY

filly. Filly, n. a young mare, colt, wild young girl

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Fil″ly (?), n.; pl. Fillies (#). [[Cf. Icel. fylia, fr. foli foal. See Foal.]] 1. 1. (Zoöl.) A female foal or colt; a young mare. Cf. Colt, Foal.
Neighing in likeness of a filly foal. Shak. 2. 2. A lively, spirited young girl. Addison.