The Collaborative International Dictionary
Tegmen
Tegmen \Teg"men\, n.; pl. Tegmina. [L., fr. tegere, tectum, to cover.]
A tegument or covering.
(Bot.) The inner layer of the coating of a seed, usually thin and delicate; the endopleura.
(Zo["o]l.) One of the elytra of an insect, especially of certain Orthoptera.
pl. (Zo["o]l.) Same as Tectrices.
Wiktionary
tegmen
n. (context biology English) A covering or integument.
Wikipedia
Tegmen
A tegmen (plural: tegmina) designates the modified leathery front wing on an insect particularly in the orders Dermaptera ( earwigs), Orthoptera ( grasshoppers, crickets and similar families), Mantodea ( praying mantis), Phasmatodea (stick and leaf insects) and Blattodea ( cockroaches).