Saint Helens Mount
Mount Saint Helens
May 18, 1980
Saint Helens, Mount
A volcanic peak, 2,550 m (8,365 ft) high, of the Cascade Range in southwest Washington. On May 18, 1980, a violent eruption reduced its height by about 400 m (1,300 ft) and covered a large area with mud and ash.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.