noun, plural the·cae [thee-see] /ˈθi si/.
a case or receptacle.
- 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
1655–65; < Latin thēca, from Greek thḗkē “case, cover,” akin to tithénai “to place, put”Related formsthe·cal, adjective
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for theca
Historical Examples of theca
But in Greek theca (, θήκη) is a place to put something, a receptacle.
The costae, longitudinal ribs or rows of spines on the outer surface of the theca.
Horizontal plates or floors found in some Corals, extending across the cavity of the "theca" from side to side.
This elastic ring is a continuation of the stalk of the theca, which always bursts on the opposite side.
This theca grows in the direction of the apex of the sicula, to which it adheres by its dorsal wall.
British Dictionary definitions for theca
noun plural -cae (-siː)
Derived Formsthecal or thecate, adjective
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
Word Origin for theca
C17: from Latin thēca, from Greek thēkē case; related to Greek tithenai to place
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
n. pl. the•cae (-sē′, -kē′)
A case, covering, or sheath, such as the outer covering of the cocoon of certain insects.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Plural thecae (thē′sē′, -kē′)
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.