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Search Result for "theca": 
Wordnet 3.0

NOUN (2)

1. a case or sheath especially a pollen sac or moss capsule;
[syn: theca, sac]

2. outer sheath of the pupa of certain insects;


The Collaborative International Dictionary of English v.0.48:

Theca \The"ca\, n.; pl. Thecae. [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. [1913 Webster] 2. (Zool.) (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. [1913 Webster]
WordNet (r) 3.0 (2006):

theca n 1: a case or sheath especially a pollen sac or moss capsule [syn: theca, sac] 2: outer sheath of the pupa of certain insects