sinapism Meaning, Definition & Usage

  1. 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. sinapismus, Gr. , the use of a mustard blister, fr. to apply a mustard blister, fr. mustard.
Definitions
  1. (Med.) A plaster or poultice composed principally of powdered mustard seed, or containing the volatile oil of mustard seed. It is a powerful irritant.

Webster 1913