calyptra

[kuh-lip-truh] /kəˈlɪp trə/
noun, Botany
1.
Also called cap. a hood or hoodlike part, as the lid of the capsule in mosses.
2.
a root cap.
Origin
1745-55; < Neo-Latin < Greek kalýptra veil, covering, equivalent to kalýp(tein) to veil, cover + -tra noun suffix
Related forms
calyptrate
[kuh-lip-treyt] /kəˈlɪp treɪt/ (Show IPA), adjective
British Dictionary definitions for calyptra

calyptra

/kəˈlɪptrə/
noun (botany)
1.
a membranous hood covering the spore-bearing capsule of mosses and liverworts
2.
any hoodlike structure, such as a root cap
Derived Forms
calyptrate (kəˈlɪpˌtreɪt) adjective
Word Origin
C18: from New Latin, from Greek kaluptra hood, from kaluptein to cover
calyptra in Science
calyptra
  (kə-lĭp'trə)   

  1. In some bryophyte plants, a structure that covers the young sporophyte as it develops within the tissues of its gametophyte parent. The calyptra, which consists of a thickening of the archegonium walls, eventually breaks open as the spore capsule grows.

  2. See root cap.