tectrices
Concise Oxford English Dictionary © 2008 Oxford University Press:
tectrices /ˈtɛktrɪsiːz, tɛkˈtrʌɪsiːz/
▶plural noun (sing. tectrix /-trɪks/) Ornithology the coverts of a bird.
– origin C19: mod. L., from L. tect-, tegere ‘cover’.
'tectrices' also found in these Oxford entries:

