sul·fide

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

Origin:
1830–40; sulf(ur) + -ide

sub·sul·fide, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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American Heritage
Medical Dictionary

sulfide sul·fide (sŭl'fīd')
n.
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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00:10
Sulfide is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a chattering or flighty, light-headed person.
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
Their chemical reactions involved hydrogen, hydrogen sulfide or iron rather
  than water, so they did not produce oxygen gas.
The possible role of hydrogen sulfide as an endogenous neuromodulator.
It induces production of hydrogen sulfide in the bloodstream, giving the
  illusion that the host is dead.
Its oil is under high pressure and laced with poisonous hydrogen sulfide, which
  requires special equipment and handling.
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