birch tar oil
Also found in: Medical.
birch tar oil[′bərch ‚tär ‚ȯil]
A toxic liquid mixture of guaiacol, phenols, cresol, xylenol, and creosol; derived from distillation of birch tar and by dry distillation of the wood of Betula alba ; used as a disinfectant, in leather dressing, and in medicine.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.