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New American Oxford Dictionary

googol

goo gol |ˈgo͞oˌgôl ˈɡuˌɡɔl | cardinal number equivalent to ten raised to the power of a hundred (10 100 ). ORIGIN 1940s: said to have been coined by the nine-year-old nephew of E. Kasner (1878 –1955 ), American mathematician, at Kasner's request.

 

googolplex

goo gol plex |ˈgo͞ogôlˌpleks ˈɡuɡɔlˌplɛks | cardinal number equivalent to ten raised to the power of a googol. ORIGIN 1940s: from googol + -plex as in multiplex .

 

Oxford Dictionary

googol

googol |ˈguːgɒl | cardinal number equivalent to ten raised to the power of a hundred (10 100 ). ORIGIN 1940s: said to have been coined by the nine-year-old nephew of E. Kasner (1878 –1955 ), American mathematician, at Kasner's request.

 

googolplex

googolplex |ˈguːg (ə )lplɛks | cardinal number equivalent to ten raised to the power of a googol. ORIGIN 1940s: from googol + -plex as in multiplex .

 

Sanseido Wisdom Dictionary

googolplex

goo gol plex /ɡúːɡ (ə )lplèks /名詞 U C 10を10 100 乗した数 .