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origanum oil

(ə-rĭgə-nəm)
n.
  1. A volatile oil obtained from various species of plants of the genus Origanum, used as a rubefacient, as a constituent in veterinary liniments, and in microscopic techniques.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.