CALYPTRA

Ca‐lyp″tra (kȧ‐lĭp″trȧ), n. [[NL., fr. Gr. καλύπτρα a covering for the head, fr. καλύπτειν to cover.]] (Bot.) A little hood or veil, resembling an extinguisher in form and position, covering each of the small flasklike capsules which contain the spores of mosses; also, any similar covering body.