
1) Vent
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https://www.crosswordclues.com/clue/fumarole

1) Volcanic hole
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https://www.crosswordclues.com/clue/fumarole

A fumarole (Latin fumus, smoke) is an opening in a planet`s crust, often in the neighborhood of volcanoes, which emits steam and gases such as carbon dioxide, sulfur dioxide, hydrogen chloride, and hydrogen sulfide. The steam is created when superheated water turns to steam as its pressure drops when it emerges from the ground. The name solfatara....
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http://en.wikipedia.org/wiki/Fumarole

A vent or opening through which issue steam, hydrogen sulfide, or other gases. The craters of many dormant volcanoes contain active fumaroles.
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http://jersey.uoregon.edu/~mstrick/geology/geo_glossary_page.html

A vent or opening through which issue steam, hydrogen sulfide, or other gases. The craters of many dormant volcanoes contain active fumaroles.
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http://midju.tripod.com/glossary.html

hole emitting gases in a volcanic region
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http://phrontistery.info/f.html

• (n.) A hole or spot in a volcanic or other region, from which fumes issue.
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http://thinkexist.com/dictionary/meaning/fumarole/

A vent or opening through which issue steam, hydrogen sulfide, or other gases. The craters of many dormant volcanoes contain active fumaroles.
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http://volcano.oregonstate.edu/glossary/1

vent in the Earth`s surface from which steam and volcanic gases are emitted. The major source of the water vapour emitted by fumaroles is groundwater ... [2 related articles]
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http://www.britannica.com/eb/a-z/f/70

Close view of a fumarole on Kilauea Volcano. Elemental sulfur vapor escaping from the fumarole has cooled to form yellow-colored crystals around its margins. Credit: R. L. Christiansen / U.S. Geological Survey A vent from which volcanic gas escapes into the atmosphere. Fumaroles may occur along...
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http://www.daviddarling.info/encyclopedia/F/fumarole.html

A vent or opening through which issue steam, hydrogen sulfide, or other gases. The craters of many dormant volcanoes contain active fumaroles.
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http://www.encyclo.co.uk/local/21455

Volcanic vent where smoke and gases escape from.
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http://www.encyclo.co.uk/local/22291

A small vent in the ground from which volcanic gases and heated groundwater emerge, but not lava.
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http://www.encyclo.co.uk/local/22392
Fu'ma·role noun [ Italian
fumaruola , from
fumo smoke, Latin
fumus : confer French
fumerolle ,
fumarolle .] A hole or spot in a volcanic or other region, from which fumes issue.
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http://www.encyclo.co.uk/webster/F/85

vents from which volcanic gases escape into the atmosphere; these usually occur along fissures or on the surface of lava flows that have cooled enough to have a crust
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http://www.pbs.org/wgbh/nova/volcano/glossary.html

A small vent in the ground from which volcanic gases and heated groundwater emerge, but not lava. Frequently, mineral deposits form around the vent.
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http://www.scientificpsychic.com/etc/geology-glossary.html

fumarole, fumerole A volcanic hole or vent through which vapor (steam and hot gasses) is emitted; a smoke-hole.
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http://www.wordinfo.info/words/index/info/view_unit/2480/

Small volcanic vent issuing gasses but no lava.
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https://www.encyclo.co.uk/local/20501

a hole in or near a volcano, from which vapor rises.
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https://www.infoplease.com/dictionary/fumarole
No exact match found.