Cyathophylloid \Cy`a*tho*phyl"loid\ (s?`?-th?-f?l"loid), a. [NL. cyathophyllum, fr. Gr. ky`aqos a cup + fy`llon a leaf.] (Paleon.) Like, or pertaining to, the family {Cyathophyllid[ae]}. [1913 Webster]
Cyathophylloid \Cy`a*tho*phyl"loid\, n. (Paleon.) A fossil coral of the family {Cyathophyllid[ae]}; sometimes extended to fossil corals of other related families belonging to the group Rugosa; -- also called {cup corals}. Thay are found in paleozoic rocks. [1913 Webster]