upper cannon upper bound • upper carboniferous · · · Info · Definitions · Synonyms · Characters · · upper cannon · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) cannon that provides plate armor for the upper arm. Synonyms: rerebrace, upper cannon. · · Noun Definition 1 Synonyms · · · rerebrace · · Synonym 1 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 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 u latin small letter u U+0075