Dictionary

plutonium

noun plu·to·ni·um \plü-ˈtō-nē-əm\

: a radioactive element that is used to make nuclear energy and nuclear weapons

Full Definition of PLUTONIUM

:  a radioactive metallic element similar chemically to uranium that is formed as the isotope 239 by decay of neptunium and found in minute quantities in pitchblende, that undergoes slow disintegration with the emission of an alpha particle to form uranium 235, and that is fissionable with slow neutrons to yield atomic energy — see element table
ADVERTISEMENT

Origin of PLUTONIUM

New Latin, from Pluton-, Pluto, the planet Pluto
First Known Use: 1942

Rhymes with PLUTONIUM

PLUTONIUM Defined for Kids

plutonium

noun plu·to·ni·um \plü-ˈtō-nē-əm\

Definition of PLUTONIUM for Kids

:  a radioactive metallic chemical element formed from neptunium and used for releasing atomic energy
Medical Dictionary

plutonium

noun plu·to·ni·um \plü-ˈtō-nē-əm\

Medical Definition of PLUTONIUM

:  a radioactive metallic element similar chemically to uranium that is formed as the isotope 239 by decay of neptunium and found in minute quantities in pitchblende, that undergoes slow disintegration with the emission of an alpha particle to form uranium 235, and that is fissionable with slow neutrons to yield atomic energy—symbol Pu; see element table

Browse

Next Word in the Dictionary: plutonomicPrevious Word in the Dictionary: plutoniteAll Words Near: plutonium
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears