plu‧to‧ni‧um /pluːˈtəʊniəm $ -ˈtoʊ-/
noun [uncountable][
Date: 1900-2000;
Language: Modern Latin;
Origin: Pluto]
a
radioactive metal that is used in the production of
nuclear power, and in nuclear weapons. It is a chemical
element: symbol Pu
[TahlilGaran] Dictionary of Contemporary English ▲