tec·trix 
(tĕktrĭks)
(tĕktrĭks)n. pl. tec·tri·ces (-trĭ-sēz′)
One of the coverts of a bird's wing.
[Latin tēctrīx, feminine of tēctor, plasterer, from tēctus, past participle of tegere, to cover; see (s)teg- in the Appendix of Indo-European roots.]