fibula fibster • fibulae · · · Info · Definitions · Synonyms · Characters · · fibula · · Text Latin · · Script 6 · · Length Definitions · · · (noun) the outer and thinner of the two bones of the human leg between the knee and ankle. Synonyms: calf bone. · · Noun Definition 1 Synonyms · · · calf bone · · Synonym 1 Characters · · a latin small letter a U+0061 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 u latin small letter u U+0075