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francium

[fran-see-uh m] /ˈfræn si əm/
noun, Chemistry.
1.
a radioactive element of the alkali metal group. Symbol: Fr; atomic number: 87.
Origin of francium
1945-1950
1945-50; after France where first identified; see -ium
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for francium

francium

/ˈfrænsɪəm/
noun
1.
an unstable radioactive element of the alkali-metal group, occurring in minute amounts in uranium ores. Symbol: Fr; atomic no: 87; half-life of most stable isotope, 223Fr: 22 minutes; valency: 1; melting pt: 27°C; boiling pt: 677°C
Word Origin
C20: from New Latin, from France + -ium; so-called because first found in France
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
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francium in Medicine

francium fran·ci·um (frān'sē-əm)
n.
Symbol Fr
An extremely unstable radioactive element of the alkali metals, having [approx] 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. Atomic number 87; valence 1.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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francium in Science
francium
  (frān'sē-əm)   
Symbol Fr
An extremely unstable, radioactive element of the alkali group. It is the heaviest metal of the group. Francium occurs in nature, but less than 28.35 g (1 oz) is present in the Earth's crust at any time. It has approximately 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. Atomic number 87; valence 1. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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