WordNet (r) 3.0 (2006):

googol
    n 1: a cardinal number represented as 1 followed by 100 zeros
         (ten raised to the power of a hundred)

The Free On-line Dictionary of Computing (19 January 2023):

googol

    The number represented in base-ten by a one with
   a hundred zeroes after it.

   According to Webster's Dictionary, the name was coined in 1938
   by Milton Sirotta, the nine-year-old nephew of American
   mathematician, Edward Kasner.

   See also googolplex.

   (2001-03-29)