Meaning of NEPTUNIUM in English


/nep tooh"nee euhm, -tyooh"-/ , n. Chem., Physics.

a transuranic element produced in nuclear reactors by the neutron bombardment of U-238: decays rapidly to plutonium and then to U-235. Symbol: Np; at. no.: 93.

[ 1940-45; NEPTUNE + -IUM ]

Random House Webster's Unabridged English dictionary.      Полный английский словарь Вебстер - Random House .