Word Study
quintillion
WORDNET DICTIONARY
Noun quintillion has 1 sense
OXFORD DICTIONARY
quintillion, n. (pl. same or quintillions) a thousand raised to the sixth (or formerly, esp. Brit., the tenth) power (10(18) and 10(30) respectively).
Derivative
quintillionth adj. & n.
Etymology
L quintus fifth + MILLION
For further exploring for "quintillion" in Webster Dictionary Online
