squillion

Etymology
See

Noun

 * 1)  A very large, unspecified number (of).
 * 2) * 1974, Fynn, Mister God, This Is Anna, Ballantine Books (2000), ISBN 0345441559, pages 102-103:
 * The word million was adequate for most things, billion came in handy on occasions, but if you wanted to use a word for a very, very large number, you just had to invent one. Anna invented one: a squillion.

Synonyms

 * See also Thesaurus:zillion.