From Longman Dictionary of Contemporary Englishdomedome /dəʊm $ doʊm/ ●●○ noun [countable] 1 
AATBa round roof on a building2 CFa shape or building like a ball cut in half
AATBa round roof on a building2 CFa shape or building like a ball cut in halfExamples from the Corpus
dome• Operating from a dome on Kitt Peak, Arizona, the Spacewatch team members have achieved numerous firsts.• The other domes cover the crossing, choir and transepts.• As in, if the city of Miami and Dade County build him a new stadium with a retractable dome.• Small domes composed of viscous lava may form within craters.• First, the meteorites crossed the dome traveling at an angle of only twenty-seven degrees to the horizon.• Higher up the dome became steeper, but by now I'd learned to trust the rock a bit more.• the dome of his bald head• There were several lesser towers, the corner ones with domes.Origin dome (1600-1700) French dôme “dome, cathedral”, from Latin domus “house” 