Category:Theca

The"ca, n.; pl. Thecæ. Etym: [l., fr. Gr. 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. (zoöl.) (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.