quattuordecillion

noun

quat·​tu·​or·​de·​cil·​lion ˌkwä-tə-ˌwȯr-di-ˈsil-yən 

often attributive

US : a number equal to 1 followed by 45 zeros see Table of Numbers

also, British : a number equal to 1 followed by 84 zeros see Table of Numbers

Word History

Etymology

Latin quattuordecim fourteen (from quattuor four + decem ten) + English -illion (as in million) — more at ten

First Known Use

1848, in the meaning defined above