noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The tissue that fills the interspaces between the costae of many madreporarian corals, usually consisting of small transverse or oblique septa.

Etymology

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

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.