The Collaborative International Dictionary
Cyathophylloid
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].
Cyathophylloid
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.
Wiktionary
cyathophylloid
n. (context paleontology English) A fossil coral of the family Cyathophyllidae.