SG Heritage Dictionary

Cyathophylloid [Adjective] Webster's Dictionary 1913

Like, or pertaining to, the family Cyathophyllidae.

Cyathophylloid [Noun] Webster's Dictionary 1913

A fossil coral of the family Cyathophyllidae; sometimes extended to fossil corals of other related families belonging to the group Rugosa; -- also called cup corals. Thay are found in paleozoic rocks.