a noxious emanation, consisting chiefly of carbon dioxide
, escaping from the earth in regions of nearly extinct volcanic activity.
one of the openings or fissures from which
this emanation issues.
1815–25; < French < Italian moffetta (Neapolitan mufeta), equivalent to muff(a) (Upper Italian mofa) mould (< Langobardic; compare German Muff mould, late Middle High German müffeln to give off a foul smell) + -etta -etta