fermi

noun

: a former SI unit of length equal to 10−15 meters : femtometer

Word History

Etymology

Enrico Fermi

First Known Use

1955, in the meaning defined above

Time Traveler
The first known use of fermi was in 1955

Dictionary Entries Near fermi

Cite this Entry

“Fermi.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fermi. Accessed 23 Jun. 2024.

Biographical Definition

Fermi

biographical name

Fer·​mi ˈfer-(ˌ)mē How to pronounce Fermi (audio)
Enrico 1901–1954 American (Italian-born) physicist
Love words? Need even more definitions?

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