thermal barrier thermal • thermal emission · · · Info · Definitions · Synonyms · Characters · · thermal barrier · · Text Common · · Latin · · Scripts 15 · · Length 5 · · Syllables Definitions · · · (noun) a limit to high speed flight imposed by aerodynamic heating. Synonyms: thermal barrier, heat barrier. · · Noun Definition 1 Synonyms · · · heat barrier · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 b latin small letter b U+0062 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D r latin small letter r U+0072 t latin small letter t U+0074