mason jar Masonite • mason moth · · · Info · Definitions · Characters · · mason jar · · Text Common · · Latin · · Scripts 9 · · Length 3 · · Syllables Definitions · · · (noun) a glass jar with an air-tight screw top; used in home canning. Synonyms: Mason jar. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 j latin small letter j U+006A m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073