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