GNU Collaborative International Dictionary of English

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