zepto-

combining form zep·to-

Definition of zepto-

:one sextillionth (10−21) part of
  • zeptosecond

Origin and Etymology of zepto-

International Scientific Vocabulary, probably alteration of hepta-; from the fact that 1021 is the seventh power of 103


Seen and Heard

What made you want to look up zepto-? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to curse or denounce

Get Word of the Day daily email!

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!