GNU Collaborative International Dictionary of English

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1.       
   Filly , n.; pl. Fillies . [Cf. Icel. fylia, fr. foli foal. See Foal.]
   (Zool.) A female foal or colt; a young mare. Cf. Colt, Foal.
   1913 Webster
   Neighing in likeness of a filly foal.
   Shak.
   
   1913 Webster
   A lively, spirited young girl. [Colloq.]
   Addison.
   
   1913 Webster