nonillion
noun
no·nil·lion nō-ˈnil-yən 
often attributive
US : a number equal to 1 followed by 30 zeros see Table of Numbers
also, British : a number equal to 1 followed by 54 zeros see Table of Numbers
Word History
Etymology
French, from Latin nonus ninth + French -illion (as in million) — more at noon
First Known Use
1690, in the meaning defined above