madreporite
(noun)
 a lightcolored calcerous opening used to filter water into the water vascular system of echinoderms
Examples of madreporite in the following topics:
- 
Phylum Echinodermata- The madreporite is a light-colored, calcerous opening used to filter water into the water vascular system of echinoderms.
- Water enters the madreporite on the aboral side of the echinoderm.
- These podocytes are connected by an internal system of canals to the madreporite.
- Madreporite 6.