'Theca' definitions:
Definition of 'theca'
From: WordNet
noun
A case or sheath especially a pollen sac or moss capsule [syn: theca, sac]
noun
Outer sheath of the pupa of certain insects
Definition of 'Theca'
From: GCIDE
- 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]