Etymology

exotheca

E1X8O1T1H4E1C3A1

Today it means: The tissue that fills the interspaces between the costae of many madreporarian corals, usually consisting of small transverse or oblique septa. Full definition →

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The story

From exo- + theca (“the calcareous wall of a corallite”).

Etymology from Wiktionary, CC BY-SA 4.0.