supinator supination • supine · · · Info · Definitions · Characters · · supinator · · Text Latin · · Script 9 · · Length Definitions · · · (noun) a muscle (especially in the forearm) that produces or assists in supination. · · Noun Definition 1 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 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 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075