polyporoid,a.Bot.|pəˈlɪpərɔɪd| [f.mod.L. Polyporus (Fries 1836–8) (a. Gr. πολύπορος: see next) + -oid.] Resembling or belonging to Polyporus, a large widely distributed genus of hymenomycetous fungi, growing in the form of projecting shelves or brackets on dead or decaying trees. 1890in Cent.Dict.