noun, plural thecae [thee-see] .
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.

1655–65; < Latin thēca < Greek thḗkē case, cover, akin to tithénai to place, put

thecal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
theca (ˈθiːkə)
n , pl -cae
1.  botany an enclosing organ, cell, or spore case, esp the capsule of a moss
2.  zoology a hard outer covering, such as the cup-shaped container of a coral polyp
[C17: from Latin thēca, from Greek thēkē case; related to Greek tithenai to place]

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Medical Dictionary

theca the·ca (thē'kə)
n. pl. the·cae (-sē', -kē')
A case, covering, or sheath, such as the outer covering of the cocoon of certain insects.

thecal the·cal (thē'kəl)
Of or relating to a sheath, especially a tendon sheath.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
theca   (thē'kə)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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