The Collaborative International Dictionary of English v.0.48:

Retepore \Re`te*pore\, n. [L. rete a net + porus pore.] (Zool.)
   Any one of several species of bryozoans of the genus
   Retepora. They form delicate calcareous corals, usually
   composed of thin fenestrated fronds.
   [1913 Webster]