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Definition of: neptunium

(nep·toomacr′nē·əm, -tyoomacr′-) noun
A radioactive element (symbol Np, atomic number 93) existing in minute amount in uranium ores and produced in gram quantities in nuclear reactors. See PERIODIC TABLE.

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Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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