FILIFORM
filamentous, filiform, filamentlike, threadlike, thready
(adjective) thin in diameter; resembling a thread
Source: WordNet® 3.1
Etymology
Adjective
filiform (comparative more filiform, superlative most filiform)
Shaped like or resembling a thread or filament; filamentous.
Having all component parts or segments cylindrical and more or less uniform in size.
Source: Wiktionary
Fil"i*form, a. Etym: [L. filum thread + -form: cf. F. filiforme.]
Definition: Having the shape of a thread or filament; as, the filiform
papillæ of the tongue; a filiform style or peduncle. See Illust. of
AntennÆ.
Source: Webster’s Unabridged Dictionary 1913 Edition