: an essential oil that consists chiefly of methyl salicylate and is obtained from the bark and twigs of the sweet birch (Betula lenta)
called also betula oil, sweet-birch oil
compare oil of wintergreenDictionary Entries Near birch oil
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“Birch oil.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/birch%20oil. Accessed 19 Apr. 2024.
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