upper peninsula upper paleolithic • upper respiratory infection · · · Info · Definitions · Characters · · upper peninsula · · Text Common · · Latin · · Scripts 15 · · Length 6 · · Syllables Definitions · · · (noun) the peninsula between Lake Superior and Lake Michigan that forms the northwestern part of Michigan. Synonyms: Upper Peninsula. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 u latin small letter u U+0075