mt. st. helens mt. rushmore • mt. vesuvius · · · Info · Definitions · Characters · · mt. st. helens · · Text Common · · Latin · · Scripts 14 · · Length 4 · · Syllables Definitions · · · (noun) an active volcano in the Cascade Range in southwestern Washington; erupted violently in 1980 after 123 years of inactivity. Synonyms: Mount Saint Helens, Mount St. Helens, Mt. St. Helens. · · Noun Definition 1 Characters · · space U+0020 . full stop U+002E e latin small letter e U+0065 h latin small letter h U+0068 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E s latin small letter s U+0073 t latin small letter t U+0074