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birch tar oil in Medicine

birch tar oil

(bûrch)
n.
  1. An oil obtained by the dry distillation of the wood of the white birch and used externally in the treatment of skin diseases.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.