Theca

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Theca

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