Calyptra
Pronunciation : Ca*lyp"tra
Part of Speech : n.
Etymology : [NL., fr. Gr. (Bot.)
Definition : Defn: A little hood or veil, resembling an extinguisher in form and position, covering each of the small flaskike capsules which contain the spores of mosses; also, any similar covering body.
Source : Webster's Unabridged Dictionary, 1913