Definition of birch–tar oil
: a brown toxic phenolic oil obtained by destructive distillation of the bark and wood of the European white birch and used in finishing Russia leather to which it gives the characteristic odor and sometimes in ointments for skin diseases (such as eczema) —called also birch oil
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up birch–tar oil? Please tell us where you read or heard it (including the quote, if possible).