tail covertEnglishOxford New American Dictionarytail covert /tāl ˈkōvərt, , teɪl ˈkoʊvərt, kōˈvərt, koʊˈvərt/ ▸ noun (in a bird's tail) each of the smaller feathers covering the bases of the main feathers.
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EnglishOxford New American Dictionary