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bronchodilator a drug that acts to dilate constricted air passages in the lungs, used esp. in the treatment of asthma.
scopolamine a thick alkaloid syrup used as a sedative or truth serum, or to dilate the pupil of the eye.
speculum a medical instrument that can be opened after insertion, used to dilate a passage or cavity so that it can be examined. [1/3 definitions]