vacuum flask vacuum filter • vacuum gage · · · Info · Definitions · Synonyms · Characters · · vacuum flask · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) flask with double walls separated by vacuum; used to maintain substances at high or low temperatures. Synonyms: vacuum flask, vacuum bottle. · · Noun Definition 1 Synonyms · · · vacuum bottle · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 f latin small letter f U+0066 k latin small letter k U+006B l latin small letter l U+006C m latin small letter m U+006D s latin small letter s U+0073 u latin small letter u U+0075 v latin small letter v U+0076