also: ネプチューニャム
noun
neptunium (Np)
Chemical element with atomic number 93. A radioactive actinide metal.
ネプツニウムはウランの核反応で生成される。
Neptunium is produced by nuclear reactions of uranium.
Standard katakana spelling for the chemical element neptunium.
Irregular kana variant; rarely used.
From English 'neptunium', named after the planet Neptune.