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The Collaborative International Dictionary of English v.0.48:

Tegmen \Teg"men\, n.; pl. Tegmina. [L., fr. tegere, tectum, to cover.] 1. A tegument or covering. [1913 Webster] 2. (Bot.) The inner layer of the coating of a seed, usually thin and delicate; the endopleura. [1913 Webster] 3. (Zool.) One of the elytra of an insect, especially of certain Orthoptera. [1913 Webster] 4. pl. (Zool.) Same as Tectrices. [1913 Webster]