— tredecillionth , adj. , n.
/tree'di sil"yeuhn/ , n. , pl. tredecillions , ( as after a numeral ) tredecillion , adj.
n.
1. a cardinal number represented in the U.S. by 1 followed by 42 zeros, and in Great Britain by 1 followed by 78 zeros.
adj.
2. amounting to one tredecillion in number.
[ 1930-35; tre ( s ) THREE + DECILLION ]