radiator cap radiation sickness • radiator casing · · · Info · Definitions · Characters · · radiator cap · · Text Common · · Latin · · Scripts 12 · · Length Definitions · · · (noun) cap on the opening in the top of a radiator through which a coolant liquid can be added. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 i latin small letter i U+0069 o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074