CALYPTRA

calyptra

(noun) the hood or cap covering the calyx of certain plants: e.g., the California poppy

Source: WordNet® 3.1

Etymology

Noun

calyptra (plural calyptras or calyptrae)

(botany) In bryophytes, a thin, hood of tissue that forms from the archegonium and covers the developing sporophyte and is shed as it ripens.

(botany) any cap-like covering of a flower or fruit, such as the operculum over the unopened buds of Eucalyptus flowers

(botany) Any of various coverings at the tips of structures, in the terminology of various authors; for example rootcaps and the apical cells of trichomes.

(entomology) In flies such as the housefly, Musca, in the taxonomic order Diptera, zoological section Schizophora, subsection Calyptrata, the calyptra is a membranous rearward extension of the forewing; it covers the haltere.

Source: Wiktionary

Ca*lyp"tra, n. Etym: [NL., fr. Gr. (Bot.)

Definition: 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 Edition