quintillion

quintillion
[kwɪnˈtɪljən]
(pl. quintillions 或［与数词连用时］复同单)

a thousand raised to the power of six (10¹⁸)
10¹⁸（1000的6次幂）
■(dated, chiefly Brit.)a million raised to the power of five (10³⁰)
(旧，主英)10³⁰（100万的5次幂）

派生
quintillionth
ordinal number
语源

late 17th cent.: from French, from million, by substitution of the prefix quinti- 'five' (from Latin quintus 'fifth') for the initial letters