safety valve safety tube • safety zone · · · Info · Definitions · Synonyms · Antonyms · Characters · · safety valve · · Text Common · · Latin · · Scripts 12 · · Length 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: relief valve, escape valve, escape cock, escape. · · Noun Definition 1 Synonyms · · · safety · · Synonym 1 refuge · · Synonym 2 guard · · Synonym 3 safety device · · Synonym 4 base hit · · Synonym 5 condom · · Synonym 6 rubber · · Synonym 7 safe · · Synonym 8 prophylactic · · Synonym 9 Antonyms · · · danger · · Antonym 0 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