Learn how to say Plutonium correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word plutonium:
the chemical element of atomic number 94, a dense silvery radioactive metal of the actinide series, used as a fuel in nuclear reactors and as an explosive in nuclear fission weapons. Plutonium only occurs in trace amounts in nature but is manufactured in nuclear reactors from uranium-238. (Symbol: Pu)
1940s: from Greek ‘Pluto’, on the pattern of neptunium, being the next planet beyond Neptune