1. a plaster containing powdered black mustard; applied to the skin as a counterirritant or rubefacient; [syn: mustard plaster, sinapism]
WordNet (r) 3.0 (2006):
mustard plaster
n 1: a plaster containing powdered black mustard; applied to the
skin as a counterirritant or rubefacient [syn: mustard
plaster, sinapism]