cy·a·tho·phyl·li·dae \ˌsīəˌthōˈfiləˌdē\noun plural Usage: capitalized Etymology: New Latin, from Cyathophyllum, type genus (from cyath- + -phyllum) + -idae : a family of Paleozoic tetracorals especially abundant in the Devonian • cy·a·tho·phyl·loid\|sīəˌthō|fiˌlȯid\adjective or noun