metacarpophalangeal joint metacarpophalangeal • metacarpus · · · Info · Definitions · Synonyms · Characters · · metacarpophalangeal joint · · Text Common · · Latin · · Scripts 25 · · Length 8 · · Syllables Definitions · · · (noun) a joint of a finger when the fist is closed. Synonyms: knuckle, knuckle joint, metacarpophalangeal joint. · · Noun Definition 1 Synonyms · · · knuckle · · Synonym 1 knuckle joint · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 j latin small letter j U+006A l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074