quadrillion

• n. 百万之四次方；千的五次方
• adj. 千之五次方的

quadr-,四，-illion,百万，缩写自million.此处为million乘以三次1000.比较billion,trillion.

quadrillion (n.)

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).