Word.ws English Dictionary

Three Mile Island

Three Mile Island proper noun: an island of Londonderry Township, Dauphin County, Pennsylvania, United States, on Lake Frederick, Susquehanna River; the site of a nuclear power plant accident in 1979.

Proper noun

Three Mile Island

  1. An island of Londonderry Township, Dauphin County, Pennsylvania, United States, on Lake Frederick, Susquehanna River; the site of a nuclear power plant accident in 1979.
  2. A nuclear power plant located on the island; the site of a nuclear accident in 1979.
  3. A nuclear reactor core partial meltdown in 1979, at the nuclear power plant's reactor unit 2
  4. An island of the town of Meredith, Belknap County, Lakes Region, New Hampshire, United States, on Lake Winnipesaukee.

Noun

Three Mile Island (plural Three Mile Islands)

  1. An informal unit of measurement for a nuclear disaster, equivalent to that of the incident in 1979 in Pennsylvania

Synonyms of Three Mile Island

Forms of Three Mile Island

pluralThree Mile Islands

Words formed from Three Mile Island

Questions about Three Mile Island

What does Three Mile Island mean?
Three Mile Island means an island of Londonderry Township, Dauphin County, Pennsylvania, United States, on Lake Frederick, Susquehanna River; the site of a nuclear power plant accident in 1979.
What part of speech is Three Mile Island?
Three Mile Island can be a proper noun or a noun.

Words near Three Mile Island in the dictionary

  1. three letter agencies
  2. three letter agency
  3. Three Lions
  4. three Ls
  5. three marks of existence
  6. Three Mile Island
  7. Three Musketeer
  8. three musketeers
  9. three o'clock
  10. Three Oaks
  11. three of a kind

Source and license

Adapted from Wiktionary: Three Mile Island (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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