[suhl-fahyd, -fid]
noun Chemistry.
a compound of sulfur with a more electropositive element or, less often, a group.

1830–40; sulf(ur) + -ide

subsulfide, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

sulfide sul·fide (sŭl'fīd')
A compound of bivalent sulfur with an electropositive element or group, especially a binary compound of sulfur with a metal.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
sulfide   (sŭl'fīd')  Pronunciation Key 
A chemical compound of sulfur and another element or radical, such as hydrogen sulfide.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Garlic is rich in allyl methyl sulfide, which can be exuded through pores the
  following day.
These secrete hydrogen sulfide, a gas which is poisonous to animal life.
The bacteria break down hydrogen sulfide in the vents, in the process releasing
  body-building energy for their hosts.
It induces production of hydrogen sulfide in the bloodstream, giving the
  illusion that the host is dead.
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