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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 ?
Rennert T, Eusterhues K, De Andrade V, Totsche KU (2013) Iron species in soils on a mofette site studied by Fe K-edge X-ray absorption spectroscopy.
The gas vent was a mofette, which presented as a small hole flooded by rain water, giving it a puddled appearance.
In the same period the [sup.3]He/[sup.4]He ratios monitored at Bublak mofette had in the main 5.9 Ra with variations from 5.4 to 6.3 Ra (Fig.
Traditionally, mofettes are specific to Covasna, Sugas, Balvanyos (Covasna County) and Baile Tusnad (Harghita county), in the so-called "mofette aureola".
He refers to the experiments of Ingenhouz, Bonet and Priestley showing that "plants exposed to Light and sun empty into the atmosphere torrents of air through their upper leaf pores, while those deprived of light exhale a deleterious mofette, truly carbonic acid."
He was French, and 'moufette', alternatively 'mofette', means 'skunk' in French.
There is a number of thermal water outflows, Komorni Hurka near Frantiskovy Lazne and Zelezna Hurka volcanoes represent remnants of Quaternary volcanic activities; in the area of Vackovec-Hartousov there are vast and intensive natural escapes of carbon-dioxide that may be observed either in a fluvial plain of the Plesna brook or in the "Soos basin" natural reserve together with dry emanations of carbon-dioxide in mud craters of the mofette type.
The gas budget in soil on mofette sites in seismic and volcanic areas is controlled by geogenic C[O.sub.2], which has ascended from the Earth's mantle together with Ar, [H.sub.2], He and [N.sub.2] at trace levels (Brauer et al.
Thus for the hydrological value were given a score between 0 abd 18 points for subcategories represented by hydro sources where water properties were taken into account in direct relation with chemistry, flow, water catchments and their therapeutic qualities, subgroups like mofette emanations were quantified by composition, radioactivity and density, and other subcategories such as lakes, rivers and waterfalls were dashed after their training, length, flow, slope, etc.
* existence of an old service experience in mofettes and mines exploitation;
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).