noun, Chemistry.
a brown liquid, C 1 8 H 2 8 O 3 S, insoluble in water, used as an insecticide synergist.
any of the compounds with the radical =SO, as dimethyl sulfoxide, (CH 3) 2 SO.

sulfoxide sulf·ox·ide (sŭl-fŏk’sīd’)
Any of various compounds that contain a sulfinyl group.


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