from dictionary.com
The World-Wide Web search engine that indexes the greatest number of web pages - over two billion by December 2001 and provides a free service that searches this index in less than a second.
The site's name is apparently derived from "googol", but note the difference in spelling.
The "Google" spelling is also used in "The Hitchhikers Guide to the Galaxy" by Douglas Adams, in which one of Deep Thought's designers asks, "And are you not," said Fook, leaning anxiously foward, "a greater analyst than the Googleplex Star Thinker in the Seventh Galaxy of Light and Ingenuity which can calculate the trajectory of every single dust particle throughout a five-week Dangrabad Beta sand blizzard?"