[suhl-fyoor-uhs, suhl-fer-]
of, pertaining to, or containing sulfur, especially in the tetravalent state.
of the yellow color of sulfur.
sulphurous ( defs 2, 3 ).

1520–30; < Latin sulfurōsus. See sulfur, -ous

sulfurously, adverb
sulfurousness, noun
nonsulfurous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

sulfurous sul·fur·ous (sŭl'fər-əs, -fyər-, sŭl-fyur'əs)

  1. Of, relating to, derived from, or containing sulfur, especially with valence 4.

  2. Characteristic of or emanating from burning sulfur.

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
sulfurous   (sŭl'fər-əs, sŭl-fyr'əs)  Pronunciation Key 
  1. Containing sulfur, especially sulfur with a valence of 4 or 3. Compare sulfuric.

  2. Characteristic of or emanating from burning sulfur.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
While common, these crudes are sulfurous and require more refining and expense
  to turn into valuable fuels such as gasoline.
Duck through a low tunnel into the cave, with its wide pool of clear sulfurous
Large eruptions do change atmospheric composition especially due to the
  sulfurous dust they generate in the stratosphere.
Sometimes the proteins turn yellow or brown, though, or acquire a strong
  odor-from mushroomy to acidic or sulfurous.
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