3 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Theca \The"ca\, n.; pl. {Thecae}. [L., fr. Gr. ? a case to put anything in. See {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. [1913 Webster] 2. (Zool.) (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. [1913 Webster] From WordNet (r) 2.0 [wn]: theca n 1: a case or sheath especially a pollen sac or moss capsule [syn: {sac}] 2: outer sheath of the pupa of certain insects [also: {thecae} (pl)] From WordNet (r) 2.0 [wn]: thecae See {theca}
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