calyptra

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

calyptra (plural calyptras or calyptrae)

1. (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 Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, Chicago, Ill.: Field Museum of Natural History, →ISBN, page 4:

     (b) sporophyte with foot reduced, the entire sporophyte enveloped by the calyptra, which is ± stipitate at the base.

2. (botany) any cap-like covering of a flower or fruit, such as the operculum over the unopened buds of Eucalyptus flowers^[1]
3. (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]
4. (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]

Borrowed from Ancient Greek κᾰλῠ́πτρᾱ (kalúptrā).

• (Classical Latin) IPA^(key): /kaˈlyp.tra/,
• (modern Italianate Ecclesiastical) IPA^(key): /kaˈlip.tra/,

calyptra f (genitive calyptrae); first declension

1. A kind of veil used by women

First-declension noun.

• “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.