1. thread-like. filiformfili*form , a. [l. filum thread + -form: cf. f. filiforme.] having the shape of a thread or filament; as, the filiform papill? of the tongue; a filiform style or peduncle. see: illust. of antenn?. [filiform thin in diameter; resembling a thread [syn: filamentous, filamentlike, threadlike, thready]