Trichite \Trich"ite\, n. [Gr. ?, ?, hair.] 1. (Min.) A kind of crystallite resembling a bunch of hairs, common in obsidian. See Illust. of {Crystallite}. 2. (Zo["o]l.) A delicate, hairlike siliceous spicule, found in certain sponges. {Trichite sheaf} (Zo["o]l.), one of the small sheaflike fascicles of slender set[ae] characteristic of certain sponges. See Illust. under {Spicule}.