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[kuh-lip-truh] /kəˈlɪp trə/
noun, Botany.
Also called cap. a hood or hoodlike part, as the lid of the capsule in mosses.
a root cap.
Origin of calyptra
1745-55; < New Latin < Greek kalýptra veil, covering, equivalent to kalýp(tein) to veil, cover + -tra noun suffix
Related forms
[kuh-lip-treyt] /kəˈlɪp treɪt/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for calyptra


noun (botany)
a membranous hood covering the spore-bearing capsule of mosses and liverworts
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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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calyptra in Science
  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.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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