Definitions for: Theca

[n] outer sheath of the pupa of certain insects
[n] a case or sheath especially a pollen sac or moss capsule

Webster (1913) Definition: The"ca, n.; pl. Thec[ae]. [L., fr. Gr. ? a case to put
anything in. See Tick a cover.]
1. A sheath; a case; as, the theca, or cell, of an anther;
the theca, or spore case, of a fungus; the theca of the
spinal cord.

2. (Zo["o]l.)
(a) The chitinous cup which protects the hydranths of
certain hydroids.
(b) The more or less cuplike calicle of a coral.
(c) The wall forming a calicle of a coral.

Synonyms: sac

See Also: case, cover, covering, natural covering, sheath

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