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Definition of Theca

Theca

  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. The chitinous cup which protects the hydranths of certain hydroids.
  3. The more or less cuplike calicle of a coral.
  4. The wall forming a calicle of a coral.

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