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also mof·fette  (mō-fĕt′)
1. An opening in the earth from which carbon dioxide and other gases escape, usually marking the last stage of volcanic activity.
2. The gases escaping from such an opening.

[French, gaseous exhalation, from Italian moffetta, diminutive of muffa, mold, moldy smell, probably of Germanic origin.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Geological Science) an opening in a region of nearly extinct volcanic activity, through which carbon dioxide, nitrogen, and other gases pass
[C19: from French, from Neapolitan Italian mofeta; compare dialect German muffezen to smell fetid]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
* existence of an old service experience in mofettes and mines exploitation;
On rare occasions in nature, emissions of geogenic CO2 from mofettes generate plant communities in sites with locally increased [CO2] in the soil and air.
The spa tourism valorize the natural resources with balneary potential (mineral, mineral-thermal water, mofettes, mud therapy, salt mines, aerosols), under a special arrangement of space (infrastructure and appropriate types of treatment facilities) and the presence of qualified medical personnel.
Among various approaches, investigations on [CO.sub.2]-rich locations (i.e., emissions occurring in vents or mofettes), have been selected as specifically attractive introducing a minimum of experimental intervention to these "natural laboratories".
Among them, one should mention contacts of several geological units in the basement, deep faults, granitic massifs, extensive Tertiary sedimentary basins with lignite deposits, Tertiary and Quaternary volcanism, mineral and thermal springs, dry gas vents (mofettes), contrast gravity anomalies, and earthquake swarms in the western part of the rift (Horalek et al., 2000).