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[ok-toh-di-sil-yuh n]
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noun, plural oc·to·de·cil·lions, (as after a numeral) oc·to·de·cil·lion.
  1. a cardinal number represented in the U.S. by 1 followed by 57 zeros, and in Great Britain by 1 followed by 108 zeros.
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  1. amounting to one octodecillion in number.
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Origin of octodecillion

1935–40; < Latin octōdec(im) eighteen + English -illion, as in million
Related formsoc·to·de·cil·lionth, adjective, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018