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calyptra

 - 3 dictionary results

ca⋅lyp⋅tra

  [kuh-lip-truh]
Use calyptra in a Sentence
–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; < NL < Gk kalýptra veil, covering, equiv. to kalýp(tein) to veil, cover + -tra n. suffix

Related forms:
ca⋅lyp⋅trate  [kuh-lip-treyt] , adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To calyptra
ca·lyp·tra   (kə-lĭp'trə)   
n.  

  1. The protective cap or hood covering the spore case of a moss or related plant.

  2. A similar hoodlike, lidlike, or caplike structure, such as a root cap.


[Medieval Latin, from Greek kaluptra, veil, from kaluptein, to cover; see kel-1 in Indo-European roots.]
ca·lyp'trate' (-trāt') adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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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.


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