safety valve safety tube • safety zone · · · Info · Definitions · Synonyms · Characters · · safety valve · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level. Synonyms: safety valve, relief valve, escape valve, escape cock, escape. · · Noun Definition 1 Synonyms · · · relief valve · · Synonym 1 escape valve · · Synonym 2 escape cock · · Synonym 3 escape · · Synonym 4 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 f latin small letter f U+0066 l latin small letter l U+006C s latin small letter s U+0073 t latin small letter t U+0074 v latin small letter v U+0076 y latin small letter y U+0079