birch tar oil


Also found in: Medical.

birch tar oil

[′bərch ‚tär ‚ȯil]
(materials)
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.