SINCE 1828
summer oil
nounDefinition 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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Merriam-Webster unabridged
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