Three Mile Island

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Three Mile Island

An island in the Susquehanna River in southeast Pennsylvania southeast of Harrisburg. It was the site of a major nuclear accident on March 28, 1979, when a partial meltdown released radioactive material and forced the evacuation of thousands of nearby residents.
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.

Three′ Mile` Is′land


n.
an island in the Susquehanna River, SE of Harrisburg, Pennsylvania: nuclear plant accident in 1979.
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An accident in 1979 at Three Mile Island Nuclear Generating Station in Pennslyvania was the worst radioactive disaster in US history.
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