tegmen
/ˈtegmən/noun
(pl. tegmina /-mɪnə/)
1- Biology a covering structure or roof of an organ, in particular【生】上盖; 萼盖物; 盖板, 尤指：
1.1
- Entomology a sclerotized forewing serving to cover the hindwing in grasshoppers and related insects【昆】覆翅; 阳（茎）基。
1.2
- Botany the delicate inner protective layer of a seed【植】内种皮。
1.3
- （亦作tegmen tympani）Anatomy a plate of thin bone forming the roof of the middle ear, a part of the temporal bone【剖】鼓室盖。
词源
early 19th cent.: from Latin, 'covering' from tegere 'to cover'.