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Panama Canal

A ship canal, about 82 km (51 mi) long, crossing the Isthmus of Panama and connecting the Caribbean Sea with the Pacific Ocean. It was begun by the French in 1881, but the project was abandoned in 1889. The United States gained construction rights after Panama declared its independence in 1903, and the canal was opened to traffic on August 15, 1914. A 1977 treaty granted Panama full sovereignty over the canal effective December 31, 1999.

Indo-European & Semitic Roots Appendices

Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

Indo-European Roots

Semitic Roots

The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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