Madreporite n. : A fossil coral.

Madreporite n. : The madreporic plate of echinoderms.

Example:
Honors zoology review help/Madreporite in sea cucumbers(see details)?

Taxonomy
madreporite, free encyclopedia, ring canal, radial canals, Close up, seawater, stone canal, lateral canals, tube foot, sea star, search, filter water, yellow button, wart, central disk, madrepore, stone coral, colony.

Defination from the web:
madreporite, the stone canal, the ring canal, the radial canals, the lateral canals, and the tube feet. The sieve-like madreporite allows entry of seawater into the stone canal, which connects to the ring canal around the mouth. ...