mustard plaster mustard oil • mustard sauce · · · Info · Definitions · Synonyms · Characters · · mustard plaster · · Text Common · · Latin · · Scripts 15 · · Length 4 · · Syllables Definitions · · · (noun) a plaster containing powdered black mustard; applied to the skin as a counterirritant or rubefacient. Synonyms: mustard plaster, sinapism. · · Noun Definition 1 Synonyms · · · sinapism · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 l latin small letter l U+006C m latin small letter m U+006D p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075