a. [ Pileus + -form. ] Having the form of a pileus or cap; pileate. [ 1913 Webster ]
a. [ L. filum thread + -form: cf. F. filiforme. ] Having the shape of a thread or filament; as, the filiform papillæ of the tongue; a filiform style or peduncle. See Illust. of Antennæ. [ 1913 Webster ]