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n. Symbol Fl
An artificially produced radioactive element with atomic number 114 that has only been produced in trace amounts and has five observed isotopes with mass numbers ranging from 285 to 289. Its most stable isotope has a half-life of about 2.7 seconds. See Periodic Table.

[After the Flerov Laboratory of Nuclear Reactions at the Joint Institute for Nuclear Research located in Dubna, Russia, which collaborated in its discovery.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Elements & Compounds) a transuranic element produced by bombarding plutonium with calcium-48 atoms. Symbol: Fl; atomic no: 114; atomic wt: 298
[C21: named after G. N. Flerov (1913–90), Soviet physicist ]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Element number 114 is now officially known as flerovium (symbol F1), after the Flerov Laboratory of Nuclear Reactions in Russia.
The elements were created at the Flerov lab in Dubna, Russia, in 1998 (flerovium) and 2000 (livermorium) by hurling calcium ions, with 20 protons each, into a piece of curium, which has 96 protons.
In that year, the International Union of Pure and Applied Chemistry (IUPAC) officially named the newly synthesized element 114 flerovium, with the symbol F1.