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calyptra

[kuh-lip-truh]
noun Botany.
  1. Also called cap. a hood or hoodlike part, as the lid of the capsule in mosses.
  2. a root cap.
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Origin of calyptra

1745–55; < New Latin < Greek kalýptra veil, covering, equivalent to kalýp(tein) to veil, cover + -tra noun suffix
Related formsca·lyp·trate [kuh-lip-treyt] /kəˈlɪp treɪt/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for calyptra

calyptra

noun botany
  1. a membranous hood covering the spore-bearing capsule of mosses and liverworts
  2. any hoodlike structure, such as a root cap
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Derived Formscalyptrate (kəˈlɪpˌtreɪt), adjective

Word Origin for calyptra

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

calyptra in Science

calyptra

[kə-lĭptrə]
  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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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.