‖Ex′o‐the″ca (?), n. [Nl., fr. Gr. ἔξω outside + � a case, box.] (Zoöl.) The tissue which fills the interspaces between the costæ of many madreporarian corals, usually consisting of small transverse or oblique septa.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.