Sin″a‐pism (?), n. [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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.