a hole in or near a volcano, from which vapor rises.

1805–15; < French fumerolle < Late Latin fūmāriōlum, diminutive of Latin fūmārium smoke chamber, equivalent to fūm(us) smoke + -ārium -arium; see -ole1

fumarolic [fyoo-muh-rol-ik] , adjective

caldera, fumarole, geyser, volcano.
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World English Dictionary
fumarole (ˈfjuːməˌrəʊl)
a vent in or near a volcano from which hot gases, esp steam, are emitted
[C19: from French fumerolle, from Late Latin fūmāriolum smoke hole, from Latin fūmus smoke]

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American Heritage
Science Dictionary
fumarole   (fy'mə-rōl')  Pronunciation Key 
A vent in the surface of the Earth from which hot smoke and gases escape. Fumaroles are found on or near volcanoes, especially in areas where volcanic activity is in its later stages.
The American Heritage® Science Dictionary
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Example sentences
Fumarole-Vents from which volcanic gas escapes into the atmosphere.
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