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1. WordNet® 3.0 (2006)
theca
    n 1: a case or sheath especially a pollen sac or moss capsule
         [syn: theca, sac]
    2: outer sheath of the pupa of certain insects

2. The Collaborative International Dictionary of English v.0.48
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]

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