Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • A rocky island of northern California in San Francisco Bay. It was a military prison from 1859 to 1933 and a federal prison until 1963. It is now a tourist attraction. The island has long been known as “the Rock.”

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • proper noun Alcatraz Island, an island in the San Francisco Bay, California, USA, formerly a famous prison

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