1. Noun
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. Noun
The chitinous cup which protects the hydranths of certain hydroids.
3. Noun
The more or less cuplike calicle of a coral.
4. Noun
The wall forming a calicle of a coral.
5. Noun
outer sheath of the pupa of certain insects
Vocabulary classified under Nature and environment
6. Noun
a case or sheath especially a pollen sac or moss capsule
Vocabulary classified under Nature and environment
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