tri·ple–deck·er 
/ˌtrɪpəlˈdɛkɚ/ noun
plural tri·ple–deck·ers /ˌtrɪpəlˈdɛkɚ/ noun [count] : something that has three levels or layers
▪ The bus we rode on was a triple-decker. — usually used before another noun ▪ We took a tour of London on a triple-decker bus. ▪ a triple-decker sandwich — compare double-decker, single-decker
▪ The bus we rode on was a triple-decker. — usually used before another noun ▪ We took a tour of London on a triple-decker bus. ▪ a triple-decker sandwich — compare double-decker, single-decker
