Cy·a·tho·phyl·loid a. Paleon. Like, or pertaining to, the family Cyathophyllidæ.
Cy·a·tho·phyl·loid, n. 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.
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