Cyathophylloid
Cy`a`tho`phyl´loid
| a. | 1.(Paleon.) Like, or pertaining to, the family Cyathophyllidæ. | n. | 1.(Paleon.) A fossil coral of the family Cyathophyllidæ; sometimes extended to fossil corals of other related families belonging to the group Rugosa; - also called cup corals. Thay are found in paleozoic rocks. |