Try Our Apps


Avoid these words. Seriously.


[fur-mee-uh m] /ˈfɜr mi əm/
noun, Chemistry, Physics.
a transuranic element. Symbol: Fm; atomic number: 100.
Origin of fermium
1950-55; named after E. Fermi; see -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
Cite This Source
British Dictionary definitions for fermium


a transuranic element artificially produced by neutron bombardment of plutonium. Symbol: Fm; atomic no: 100; half-life of most stable isotope, 257Fm: 80 days (approx.)
Word Origin
C20: named after Enrico Fermi
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for fermium



discovered in the debris of a 1952 U.S. nuclear test in the Pacific, named 1955 for Italian-born U.S. physicist Enrico Fermi (1901-1954).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
fermium in Medicine

fermium fer·mi·um (fûr'mē-əm, fěr'-)
Symbol Fm
A synthetic radioactive metallic element whose most stable isotope is Fm 257 with a half-life of [approx] 100 days. Atomic number 100.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
fermium in Science
Symbol Fm
A synthetic, radioactive metallic element of the actinide series that is produced from plutonium or uranium. Its most stable isotope is Fm 257 with a half-life of approximately 100 days. Atomic number 100. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Nearby words for fermium

Difficulty index for fermium

Few English speakers likely know this word

Word Value for fermium

Scrabble Words With Friends