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.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.