- quadrillion (n.)
[quadrillion 词源字典]
- 1670s, from French quadrillion (16c.) from quadri- "four" (see quadri-) + (m)illion. Compare billion. In Great Britain, the fourth power of a million (1 followed by 24 zeroes); in the U.S., the fifth power of a thousand (1 followed by 15 zeroes).[quadrillion etymology, quadrillion origin, 英语词源]