madreporal

adjective2

1. •
   Characteristic of or associated with reef coral of genus Madrepora; madreporic.

   • The instrument is about twenty feet above sea level, and is built on ground composed of hard madreporal rock. — 1914
2. •
   Pertaining to a sieve-like plate in echinoderms, which admits water into the ambulacral tubes;

   • Between these vascular rings there is a long muscular heart, which, united to the calcareous pouch or cord, extends from the madreporal plate to the mouth. — 1874