Alamogordo is a city in Otero County, New Mexico. It is best known for being the site of the first atomic bomb test, code-named 'TRINITY', which was conducted by the United States Army on July 16, 1945. The term 'Alamogordo' is derived from two Spanish words, 'ALAMO' meaning 'COTTONWOOD' and 'gordo' meaning 'FAT'. The term ATESTS, which is a 6 letter solution to the crossword, is an acronym for the Atomic Testing Site, which is located in Alamogordo. OTERO, which is a 5 letter solution to the crossword, is the name of the county in which Alamogordo is located.