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a city in SW Louisiana.
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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
sulfur also sulphur   (sŭl'fər)  Pronunciation Key 
Symbol S
A pale-yellow, brittle nonmetallic element that occurs widely in nature, especially in volcanic deposits, minerals, natural gas, and petroleum. It is used to make gunpowder and fertilizer, to vulcanize rubber, and to produce sulfuric acid. Atomic number 16; atomic weight 32.066; melting point (rhombic) 112.8°C; (monoclinic) 119.0°C; boiling point 444.6°C; specific gravity (rhombic) 2.07; (monoclinic) 1.957; valence 2, 4, 6. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Mineral pools on the lake are purported to have healing properties because of
  their high sulphur content.
Actually silver tarnishes when exposed to industrial pollutants such as ozone
  and sulphur.
Extracting sulphur all day is a brutal occupation.
Radioactive sulphur signal adds to evidence of catastrophe.
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