heat wave heat up • heat weight · · · Info · Definitions · Characters · · heat wave · · Text Common · · Latin · · Scripts 9 · · Length 2 · · Syllables Definitions · · · (noun) a wave of unusually hot weather. Synonyms: heat wave. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 t latin small letter t U+0074 v latin small letter v U+0076 w latin small letter w U+0077