quadrillion [kwɒˈdrɪljən] (pl. quadrillions或 [与数字连用时]复同单)
a thousand raised to the power of five (1015) 1015(1,000的5次幂) ■(dated, chiefly Brit.)a thousand raised to the power of eight (1024) (旧,主英)1024(1,000的8次幂)
派生 quadrillionth ordinal number 语源
late 17th cent.: from French, from million, by substitution of the prefix quadri- 'four' for the initial letters