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4 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 the·ca /ˈθikə/
 囊,膜,鞘

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 the·ca /ˈθɪkə/ 名詞
 膜,鞘

From: Webster's Revised Unabridged Dictionary (1913)

 The·ca n.; pl. Thecae
 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. 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.
 

From: WordNet (r) 2.0

 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)]