Medical Definition of pine-needle oil
: a colorless or yellowish bitter essential oil obtained from the needles of various pines (as Pinus sylvestris or P. mugo) and used in medicine chiefly as an inhalant in treating bronchitis
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“Pine-needle oil.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/pine-needle%20oil. Accessed 26 Jun. 2022.
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