[dahy-suhl-fahyd, -fid]
noun Chemistry.
(in inorganic chemistry) a sulfide containing two atoms of sulfur, as carbon disulfide, CS 2 .
(in organic chemistry) a sulfide containing the bivalent group −SS−, as diethyl disulfide, C 4 H 10 S 2 .
Also, disulphide.

1860–65; di-1 + sulfide

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World English Dictionary
disulphide (daɪˈsʌlfaɪd)
Also called (not in technical usage): bisulphide any chemical compound containing two sulphur atoms per molecule

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American Heritage
Medical Dictionary

disulfide di·sul·fide (dī-sŭl'fīd')
A chemical compound containing two sulfur atoms combined with other elements or radicals. Also called bisulfide.

The American Heritage® Stedman's Medical Dictionary
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