adjective Chemistry.
of, pertaining to, or containing sulfur, especially in the hexavalent state.

1780–90; < French sulfurique; see sulfur, -ic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sulphur or sulfur (ˈsʌlfə)
a.  an allotropic nonmetallic element, occurring free in volcanic regions and in combined state in gypsum, pyrite, and galena. The stable yellow rhombic form converts on heating to monoclinic needles. It is used in the production of sulphuric acid, in the vulcanization of rubber, and in fungicides. Symbol: S; atomic no: 16; atomic wt: 32.066; valency: 2, 4, or 6; relative density: 2.07 (rhombic), 1.957 (monoclinic); melting pt: 115.22°C (rhombic), 119.0°C (monoclinic); boiling pt: 444.674°CRelated: thionic
 b.  (as modifier): sulphur springs
Related: thionic
[C14 soufre, from Old French, from Latin sulfur]
sulfur or sulfur
Related: thionic
[C14 soufre, from Old French, from Latin sulfur]
sulphuric or sulfur
sulfuric or sulfur

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
sulfuric   (sŭl-fyr'ĭk)  Pronunciation Key 
Containing sulfur, especially sulfur with a valence of 6. Compare sulfurous.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Producers add sulfuric acid to form phosphoric acid, which is later converted
  to ammonium phosphate.
Sulfur dioxide turns into sulfuric acid which is hazardous to health.
The sulfuric acid they excrete gnaws away at the cave's limestone walls much
  faster than water alone would.
However, they do reveal sulfuric acid, an integral component of volcanic
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