sinapism sinapis arvensis • sinapize · · · Info · Definitions · Synonyms · Characters · · sinapism · · Text Latin · · Script 8 · · Length 4 · · Syllables Definitions · · · (noun) a plaster containing powdered black mustard; applied to the skin as a counterirritant or rubefacient. Synonyms: mustard plaster. · · Noun Definition 1 Synonyms · · · mustard plaster · · Synonym 1 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E p latin small letter p U+0070 s latin small letter s U+0073