Ko·re·a (kə-rēə, kô-, kō-)
A peninsula and former country of eastern Asia between the Yellow Sea and the Sea of Japan. Site of an ancient civilization dating to the 12th century BC, the peninsula was united as a kingdom in the 7th century AD and despite a Mongol invasion (13th century) remained unified until the Japanese occupation of 1910 to 1945. After World War II the Soviet- and US-occupied territories formed separate republics, and a North Korean invasion of the south led to the Korean War (1950-1953). The peninsula is now divided between North Korea and South Korea.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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:
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.