from The American Heritage® Dictionary of the English Language, 4th Edition
- A rocky island of western 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 n. Alcatraz Island, an island in the San Francisco Bay, California, USA, formerly a famous prison
Sorry, no etymologies found.