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summer oil

noun
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Definition of summer oil

1 : an oil that solidifies partly or wholly in cold weather: such as
a : cottonseed oil from which the stearin has not been removed
b : a heavy mineral lubricating oil
2 : any of several highly refined oils used as foliage sprays to control insects (such as the codling moth)

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“Summer oil.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/summer%20oil. Accessed 13 December 2019.

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