filum filtration surgery • filum aquae · · · Info · Definitions · Synonyms · Characters · · filum · · Text Latin · · Script 5 · · Length 2 · · Syllables Definitions · · · (noun) a threadlike structure (as a chainlike series of cells). Synonyms: filament. · · Noun Definition 1 Synonyms · · · filament · · Synonym 1 Characters · · f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D u latin small letter u U+0075