calyptra

名词 n.
中文释义

英文释义

名词 n.
  1. In bryophytes, a thin hood of tissue that forms from the archegonium and covers the developing sporophyte and is shed as it ripens.
    — (b) sporophyte with foot reduced, the entire sporophyte enveloped by the calyptra, which is ± stipitate at the base.
  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.

词形变化

calyptras plural calyptrae plural

词汇关系

衍生词
calyptrate calyptriform

词源

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