largest of the Mariana Islands, in the W Pacific: an unincorporated territory of the U.S.: 209 sq mi (541 sq km); pop. 155,000; cap. Agana: abbrev. GU
See Guam in American Heritage Dictionary 4
(gwäm)
Abbr. GU
An unincorporated territory of the United States, the largest and most southerly of the Mariana Islands in the western Pacific Ocean. Discovered by Magellan in 1521, the island was ceded by Spain to the United States in 1898. Agana is the capital. Population: 173,000.