sinapism Meaning, Definition & Usage
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noun a plaster containing powdered black mustard; applied to the skin as a counterirritant or rubefacient
mustard plaster.
WordNet
Sin"a*pism noun
Etymology
L.Definitions
(Med.) A plaster or poultice composed principally of powdered mustard seed, or containing the volatile oil of mustard seed. It is a powerful irritant.