The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A volcano, 1,699 m (5,771 ft) high, of the Philippines, in the west-central part of Luzon Island northwest of Manila. It erupted catastrophically in June 1991 after 600 years of dormancy, killing hundreds of people and burying hundreds of square miles under volcanic ash.