Medical Definition of cinnamon oil
: an oil obtained from a tree or shrub of the genus Cinnamomum: as
b
: a yellowish or brownish essential oil obtained from the leaves and young twigs of a cinnamon tree (Cinnamomum cassia) and used chiefly as a flavoring
— called also cassia oil
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“Cinnamon oil.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/cinnamon%20oil. Accessed 21 Jan. 2022.
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