01 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.
pl.
Thecae ((#))
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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.
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2.
The chitinous cup which protects the hydranths of certain hydroids.(Zool.)