noun
a substance that causes irritation or inflammation in one part of the body in order to relieve pain or inflammation in another part
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The pharmacist recommended using a counterirritant cream to alleviate the muscle pain.
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My mom swears by this counterirritant gel for her arthritis.
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I always keep a tube of that counterirritant stuff in my gym bag.
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Laughter can act as a counterirritant to the stresses of everyday life.