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2 definitions found

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

 exotheca
 外鞘

From: Webster's Revised Unabridged Dictionary (1913)

 Ex·o·the·ca n.  Zoöl. The tissue which fills the interspaces between the costæ of many madreporarian corals, usually consisting of small transverse or oblique septa.