Three Mile Island
geographical name
island in the Susquehanna River in southeast central Pennsylvania
Note: Three Mile Island was the site of a nuclear power plant accident in 1979.
Cite this Entry
“Three Mile Island.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Three%20Mile%20Island. Accessed 4 Nov. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share