fibril fibriform • fibrilla · · · Info · Definitions · Synonyms · Characters · · fibril · · Text Latin · · Script 6 · · Length Definitions · · · (noun) a very slender natural or synthetic fiber. Synonyms: filament, strand. · · Noun Definition 1 Synonyms · · · filament · · Synonym 1 strand · · Synonym 2 Characters · · b latin small letter b U+0062 f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C r latin small letter r U+0072