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hydromorphone hydrochloride

(hī′drō-môrfōn′)
n.
  1. A synthetic derivative of morphine used as a respiratory sedative and analgesic that is more potent than morphine.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.