filly

noun
🔊/ˈfɪli/
🔊/ˈfɪli/
(plural fillies)
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  1. a young female horse, especially one that is less than 4 years old 小牝马compare colt, mareTopics Animalsc2, Sports: other sportsc2
    Word Originlate Middle English: from Old Norse fylja, of Germanic origin; related to foal.