millimeter of mercury millimeter • millimetre · · · Info · Definitions · Synonyms · Characters · · millimeter of mercury · · Text Common · · Latin · · Scripts 21 · · Length 8 · · Syllables Definitions · · · (noun) a unit of pressure equal to 0.001316 atmosphere; named after Torricelli. Synonyms: torr, millimeter of mercury, mm Hg. · · Noun Definition 1 Synonyms · · · torr · · Synonym 1 mm hg · · Synonym 2 Characters · · space U+0020 c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D o latin small letter o U+006F r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075 y latin small letter y U+0079