ˌsäfēˈōnē, ˌsōf-, -ō(ˌ)nā noun
( plural soffio·ni -ō(ˌ)nē)
Etymology: Italian, from aug. of soffio puff, blast, from soffiare to blow, from Latin sufflare to inflate, blow upon — more at sufflate
: a jet of steam usually accompanied by other vapors that issues from the ground in a volcanic region