from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A volcanic area that gives off sulfurous gases and steam.

from the GNU version of the Collaborative International Dictionary of English

  • n. A volcanic area or vent which yields only sulphur vapors, steam, and the like. It represents the stages of the volcanic activity.

from The Century Dictionary and Cyclopedia

  • n. An area of more or less corroded and disintegrated volcanic rock, over which sulphurous gases, steam, and other volcanic emanations escape through various orifices, frequently giving rise to what are known as mud-volcanoes, mud-cones, or salses; a region of dying or dormant volcanism.


Italian, from solfo, sulfur, from Latin sulfur.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Solfatara, the name of a volcano near Naples, from Italian solfo ("sulphur"). (Wiktionary)



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  • The Italian word for sulphur is zolfo, while solfo is archaic.

    June 22, 2010

  • ~from the Italian solfo (sulphur)

    January 18, 2009

  • ~vent in a volcano through which sulfur-rich gases and steam escape, leaving bright yellow sulfur deposits

    January 18, 2009