calyptra(redirected from Calyptræ)
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1. The protective cap or hood covering the spore case of a moss or related plant.
2. A similar hoodlike or caplike structure, such as a root cap.
[Medieval Latin, from Greek kaluptra, veil, from kaluptein, to cover; see kel- in Indo-European roots.]
ca·lyp′trate′ (-trāt′) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Botany) a membranous hood covering the spore-bearing capsule of mosses and liverworts
2. (Botany) any hoodlike structure, such as a root cap
[C18: from New Latin, from Greek kaluptra hood, from kaluptein to cover]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
n., pl. -tras.
1. a hood or hoodlike part, as the lid of the capsule in mosses.
2. a root cap.
[1745–55; < New Latin < Greek kalýptra veil, covering]
ca•lyp′trate (-treɪt) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.