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Meaning of sulfoxide

sulf•ox•ide

Pronunciation: (sul-fok'sīd) [key]
— n. Chem.
  1. a brown liquid, CHOS, insoluble in water, used as an insecticide synergist.
  2. any of the compounds with the radical =SO, as dimethyl sulfoxide, (CH)SO.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.