Definition: Meaning of, St Helens, Mount in English to English dictionary.
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a VOLCANO in WASHington State in the northwestern US, which ERUPT ed in 1980 after a quiet period of over a hundred years, sending out ASH (= powder produced when something has been burnt) and LAVA (= hot liquid rock) over a wide area. The large amount of ASH in the air affected the weather in many northern parts of the world for some time.