calyptra

[kuh-lip-truh]
|

noun Botany.

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

Nearby words

  1. calydonian boar,
  2. calydonian hunt,
  3. calymmatobacterium,
  4. calypso,
  5. calypsonian,
  6. calyptrogen,
  7. calyx,
  8. calzaghe,
  9. calzone,
  10. calèche

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. 2019

Examples from the Web for calyptra


British Dictionary definitions for calyptra

calyptra

noun botany

a membranous hood covering the spore-bearing capsule of mosses and liverworts
any hoodlike structure, such as a root cap
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

Science definitions for calyptra

calyptra

[kə-lĭptrə]

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.
See root cap.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.