Mount St. Helens

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Noun1.Mount St. Helens - an active volcano in the Cascade Range in southwestern WashingtonMount St. Helens - an active volcano in the Cascade Range in southwestern Washington; erupted violently in 1980 after 123 years of inactivity
Evergreen State, WA, Washington - a state in northwestern United States on the Pacific
Cascade Mountains, Cascade Range, Cascades - a mountain range in the northwestern United States extending through Washington and Oregon and northern California; a part of the Coast Range