From The Collaborative International Dictionary of English v.0.44 [gcide]:
Sinapism \Sin"a*pism\, noun [L. sinapismus, Gr. ????, the use of a mustard blister, fr. ??? to apply a mustard blister, fr. ???? mustard.] (Med.) A plaster or poultice composed principally of powdered mustard seed, or containing the volatile oil of mustard seed. It is a powerful irritant.
From WordNet (r) 2.0 [wn]:
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