mustard plaster

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mustard plaster

A medicinal plaster made with a pastelike mixture of powdered black mustard, flour, and water, used especially as a counterirritant. Also called sinapism.

mustard plaster

Herbal medicine
A poultice used to relieve minor pain; if left in place for too long a period, mustard plasters may cause vesiculation.


[Gr. emplastron]
1. A material, usually plaster of Paris, that is applied to a part and allowed to harden in order to immobilize the part or to make an impression. In many settings, plaster of Paris has been replaced with synthetic cast materials, such as fiberglass.
2. A topical preparation in which the constituents are formed into a tenacious mass of substance harder than an ointment and spread upon muslin, linen, skin, or paper.

dental plaster

A powder, when mixed with water, that hardens to form a stonelike investment or model material. It is composed of a hemihydrate of gypsum (CaSO4·2H2O), which differs in compression strength and expansion coefficient according to how it is treated and rehydrated. There are four classes of dental plaster, with differing uses as materials for casts, impressions, or stone models, based on the differences of characteristics.

mustard plaster


plaster of Paris

Gypsum cement, hemihydrated calcium sulfate (CaSO4·2H2O), mixed with water to form a paste that sets rapidly; used to make casts and stiff bandages.

salicylic acid plaster

A uniform mixture of salicylic acid spread on an appropriate base such as paper, cotton, or fabric. It is applied topically for use as a keratolytic agent.
References in periodicals archive ?
As for the treatment of the common cold in my day, it may have been more merciful than the mustard plaster, but still there were hazards.
Ygnacio turns his daughter over, instead, to lesser quacks, who stick on leeches, scald her with mustard plasters, bathe her in urine and cause her to suffer those very convulsions and deliriums symptomatic equally of rabies and of madness, just as prophetic speech and levitation were evidence at the time, equally, of demonic possession and of sainthood.