water jacket waterishness • water-jacket · · · Info · Definitions · Characters · · water jacket · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) a container filled with water that surrounds a machine to cool it; especially that surrounding the cylinder block of an engine. Synonyms: water jacket. · · Noun Definition 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 j latin small letter j U+006A k latin small letter k U+006B r latin small letter r U+0072 t latin small letter t U+0074 w latin small letter w U+0077