# calyptra

> English word · Noun

## Definitions
1. In bryophytes, a thin hood of tissue that forms from the archegonium and covers the developing sporophyte and is shed as it ripens.
2. any cap-like covering of a flower or fruit, such as the operculum over the unopened buds of Eucalyptus flowers
3. Any of various coverings at the tips of structures, in the terminology of various authors; for example rootcaps and the apical cells of trichomes.
4. 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.

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

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/calyptra