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
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“Birch-tar oil.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/birch-tar%20oil. Accessed 13 Aug. 2022.
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