attosecond
at·to·se·cond
noun
1.
one quintillionth of a second; one thousandth of a femtosecond
Origin
From atto- + second.
Related words
Broader terms
Parts
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.