Definition of "volcano" []

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

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "If under the term volcano be included all mountains which have been in a state of eruption within the historical period, those which have a true volcanic form, together with those that still exhibit on their flanks matter ejected from a crater, we may conclude that there are at least 100 such mountains in the Japanese empire."
• "The summit of the volcano is around 5000 ft (1650 m) above sea level."
• "Yesterday, scientists issued what they call a volcano advisory, that is the highest warning before an eruption."