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calyptra's
2 dictionary results for: calyptra's
American Heritage Dictionary - Cite This Source - Share This
ca·lyp·tra     (kə-lĭp'trə)  Pronunciation Key 
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 © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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The American Heritage Science Dictionary - Cite This Source - Share This
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 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
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