Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Either of two pale-yellow, highly toxic organophosphorous liquids, C6H15O3PS2 or C6H15O4PS2, used as systemic insecticides.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An organophosphate insecticide, 1-(2-diethoxyphosphorylsulfanylethylsulfanyl)ethane.

Etymologies

d(i)-1 + e(thyl) + me(rcaptan) + t(hi)on(ate), salt or ester of a thionic acid (thion- + -ate2).
(American Heritage® Dictionary of the English Language, Fourth Edition)

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