from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. See mustard plaster.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Application of a mustard plaster

from the GNU version of the Collaborative International Dictionary of English

  • n. A plaster or poultice composed principally of powdered mustard seed, or containing the volatile oil of mustard seed. It is a powerful irritant.

from The Century Dictionary and Cyclopedia

  • n. A plaster composed wholly or in part of mustard-flour; a mustard-plaster.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a plaster containing powdered black mustard; applied to the skin as a counterirritant or rubefacient


French sinapisme, from Late Latin sināpismus, from Greek sināpismos, use of a mustard plaster, from sināpizein, to apply a mustard plaster, from sināpi, mustard, perhaps variant of earlier nāpu.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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  • "On the doctors' orders, a hospital steward from Lincoln Hospital, a nearby military facility, sprinted from the bedside and returned with hot water, brandy, blankets, and a large sinapism, or mustard plaster."
    —James L. Swanson, Manhunt: The 12-Day Search for Lincoln's Killer, 110

    May 29, 2008