From Longman Dictionary of Contemporary EnglishRelated topics: Animals, Horsesfillyfil‧ly /ˈfɪli/ noun (plural fillies) [countable]HBADSHa young femalehorse → colt, foalExamples from the Corpusfilly• It had been fillyembraced as the true faith.• Eight fillies were entered for the first local 2-year-old race of 1996 on Wednesday.• The flyingfilly had trainerJackBerrypurring after a stunningsuccess at Beverley last month.• I want Marking Time and that three-year-old filly of yours to run at Kempton on Saturday.• Something was clearly wrong with the Mr Prospectorfilly, and maybe not just the faster ground.• She loved this filly and would have been so proud.Originfilly(1400-1500)Old Norsefylja