Quintilllion

Quin`till´lion


n.1.According to the French notation, which is used on the Continent and in America, the cube of a million, or a unit with eighteen ciphers annexed; according to the English notation, a number produced by involving a million to the fifth power, or a unit with thirty ciphers annexed. See the Note under Numeration.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.