noun Botany.
Also called cap. a hood or hoodlike part, as the lid of the capsule in mosses.
a root cap.

1745–55; < Neo-Latin < Greek kalýptra veil, covering, equivalent to kalýp(tein) to veil, cover + -tra noun suffix

calyptrate [kuh-lip-treyt] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
calyptra (kəˈlɪptrə)
1.  a membranous hood covering the spore-bearing capsule of mosses and liverworts
2.  any hoodlike structure, such as a root cap
[C18: from New Latin, from Greek kaluptra hood, from kaluptein to cover]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
calyptra   (kə-lĭp'trə)  Pronunciation Key 
  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.

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