theca
a case or receptacle.
Botany, Mycology.
a sac, cell, or capsule.
a sporangium.
Anatomy, Zoology. a case or sheath enclosing an organ, structure, etc., as the horny covering of an insect pupa or the loose membrane covering the spinal cord.
Origin of theca
1Other words from theca
- thecal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use theca in a sentence
These two types are, in the main, correlated with two gradual differentiations in the minute structure of the thecal plates.
The brachia rise from a corresponding number of thecal plates, “radials (RR).”
At the same time the thecal plates degenerated into spicules.
British Dictionary definitions for theca
/ (ˈθiːkə) /
botany an enclosing organ, cell, or spore case, esp the capsule of a moss
zoology a hard outer covering, such as the cup-shaped container of a coral polyp
Origin of theca
1Derived forms of theca
- thecal or thecate, adjective
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
Scientific definitions for theca
[ thē′kə ]
A case, covering, or sheath, such as the pollen sac of an anther, the spore case of a moss, or the outer covering of the pupa of certain insects.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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