volcano definition | Dictionary.com

vol⋅ca⋅no

[vol-key-noh]

–noun, plural -noes, -nos.

1.	a vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals.

2.	a mountain or hill, usually having a cuplike crater at the summit, formed around such a vent from the ash and lava expelled through it.

Origin:
1605–15; < It < L Volcānus, var. of Vulcānus Vulcan

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Based on the Random House Dictionary, © Random House, Inc. 2009.
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vol·ca·no (vŏl-kā'nō)

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n. pl. vol·ca·noes or vol·ca·nos

1. An opening in the earth's crust through which molten lava, ash, and gases are ejected.
2. A similar opening on the surface of another planet.
A mountain formed by the materials ejected from a volcano.

[Italian, from Spanish volcán or Portuguese volcão, both probably from Latin volcānus, vulcānus, fire, flames, from Volcānus, Vulcan.]

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Volcano

Vol*ca"no\, n.; pl. Volcanoes. [It. volcano, vulcano, fr. L. Vulcanus Vulkan, the god of fire. See Vulkan.] (Geol.) A mountain or hill, usually more or less conical in form, from which lava, cinders, steam, sulphur gases, and the like, are ejected; -- often popularly called a burning mountain.

Note: Volcanoes include many of the most conspicuous and lofty mountains of the earth, as Mt. Vesuvius in Italy (4,000 ft. high), Mt. Loa in Hawaii (14,000 ft.), Cotopaxi in South America (nearly 20,000 ft.), which are examples of active volcanoes. The crater of a volcano is usually a pit-shaped cavity, often of great size. The summit crater of Mt. Loa has a maximum length of 13,000 ft., and a depth of nearly 800 feet. Beside the chief crater, a volcano may have a number of subordinate craters.

Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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Language Translation for : volcano

Spanish: volcán,

German: der Vulkan,

Japanese: 火山

More Translations »

volcano

A cone-shaped mountain or hill created by molten material that rises from the interior of the Earth to the surface.

Note: Volcanoes tend to occur along the edges of tectonic plates.

Note: Eruptions and lava flows associated with them can be very destructive. (See Mount Saint Helens and Mount Vesuvius.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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volcano

1613, from It. vulcano "burning mountain," from L. Vulcanus "Vulcan," Roman god of fire, also "fire, flames, volcano" (see Vulcan). The name was first applied to Mt. Etna by the Romans, who believed it was the forge of Vulcan. Volcanic first recorded 1774, from Fr. volcanique. Fig. sense of "prone to explosive activity" is attested from 1854.

volcano (vŏl-kā'nō) Pronunciation Key

An opening in the Earth's crust from which lava, ash, and hot gases flow or are ejected during an eruption.
A usually cone-shaped mountain formed by the materials issuing from such an opening. Volcanoes are usually associated with plate boundaries but can also occur within the interior areas of a tectonic plate. Their shape is directly related to the type of magma that flows from them—the more viscous the magma, the steeper the sides of the volcano. ◇ A volcano composed of gently sloping sheets of basaltic lava from successive volcanic eruptions is called a shield volcano. The lava flows associated with shield volcanos, such as Mauna Loa, on Hawaii, are very fluid. ◇ A volcano composed of steep, alternating layers of lava and pyroclastic materials, including ash, is called a stratovolcano. Stratovolcanos are associated with relatively viscous lava and with explosive eruptions. They are the most common form of large continental volcanos. Mount Vesuvius, Mount Fuji, and Mount St. Helens are stratovolcanos. Also called composite volcano. See more at hot spot , island arc , tectonic boundary , volcanic arc.

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