quintillionth
quin·til·lionth
noun
1.
one part in a quintillion
Origin
From quintillion + -th (ordinal suffix).
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.