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Definition of Cyathophylloid
1. a. Like, or pertaining to, the family Cyathophyllidæ.
2. n. 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.
Definition of Cyathophylloid
1. Noun. (paleontology) A fossil coral of the family Cyathophyllidae. ¹
¹ Source: wiktionary.com