calyptra

English

Ripening moss sporophyte shedding its calyptra

Bud of a flower of a grape shedding its calyptra

Calyptrae splitting off the opening buds of Eucalyptus ficifolia

Calyptra(1) over a fly's haltere(3)

From Ancient Greek καλύπτρα (kalúptra, “covering or veiling”).

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.[1]
- 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page 4:
  (b) sporophyte with foot reduced, the entire sporophyte enveloped by the calyptra, which is ± stipitate at the base.
(botany) any cap-like covering of a flower or fruit, such as the operculum over the unopened buds of Eucalyptus flowers[1]
(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.[1]
(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.[2]

thin, hood-like tissue

Jackson, Benjamin, Daydon; A Glossary of Botanic Terms with their Derivation and Accent; Published by Gerald Duckworth & Co. London, 4th ed 1928
C. R, Osten Sacken. Notice on the terms: Tegula, antitegula, squama and alula, as used in Dipterology

Borrowed from Ancient Greek κᾰλῠ́πτρᾱ (kalúptrā).

calyptra f (genitive calyptrae); first declension

First declension.

calyptra in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
calyptra in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette