Try Our Apps


The Best Internet Slang


[mahyt-nur-ee-uh m] /maɪtˈnɜr i əm/
noun, Chemistry, Physics.
a superheavy, synthetic, radioactive element. Symbol: Mt; atomic number: 109.
Formerly unnilennium, element 109.
Origin of meitnerium
named after Austrian physicist Lise Meitner; see -ium Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
British Dictionary definitions for meitnerium


a synthetic element produced in small quantities by high-energy ion bombardment. Symbol: Mt; atomic no: 109
Word Origin
C20: named after Lise Meitner
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
meitnerium in Science
Symbol Mt
A synthetic, radioactive element that is produced by bombarding bismuth with iron ions. Its most long-lived isotopes have mass numbers of 266 and 268 with half-lives of 3.4 milliseconds and 70 milliseconds, respectively. Atomic number 109. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for meitnerium

Few English speakers likely know this word

Word Value for meitnerium

Scrabble Words With Friends

Nearby words for meitnerium