francium

noun
fran·​ci·​um | \ˈfran(t)-sē-əm \

Definition of francium 

: a short-lived radioactive element of the alkali-metal group occurring naturally as a disintegration product of actinium and also produced artificially — see Chemical Elements Table

First Known Use of francium

1946, in the meaning defined above

History and Etymology for francium

New Latin, from France

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The first known use of francium was in 1946

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francium

noun
fran·​ci·​um | \ˈfran(t)-sē-əm \

Medical Definition of francium 

: a radioactive element of the alkali-metal group discovered as a disintegration product of actinium and obtained artificially by the bombardment of thorium with protons symbol Fr — see Chemical Elements Table

More from Merriam-Webster on francium

Britannica.com: Encyclopedia article about francium

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