— nonillionth , n. , adj.
/noh nil"yeuhn/ , n. , pl. nonillions , ( as after a numeral ) nonillion , adj.
n.
1. a cardinal number represented in the U.S. by 1 followed by 30 zeros, and in Great Britain by 1 followed by 54 zeros.
adj.
2. amounting to one nonillion in number.
[ 1680-90; non- ( nonus ninth) + -illion, as in million MILLION ]