Neptune /nepˈtūn/

1. The Roman sea god, identified with the Greek Poseidon
2. A remote planet of the solar system, discovered in 1846

Neptūˈnian adjective

1. Relating to Neptune or to the sea
2. Formed by water (geology)

1. An imagined inhabitant of Neptune
2. A Neptunist

Nepˈtūnist noun

A believer in the origin of rocks generally as chemical precipitates from the sea, opp to Plutonist or Vulcanist

neptūˈnium noun

An artificially produced radioactive transuranic metallic element (symbol Np; atomic no 93) named as next after uranium, as Neptune is next after Uranus

neptunium series noun

A series formed by the decay of artificial radio-elements, the first member being plutonium-241 and the last bismuth-209, neptunium-237 being the longest-lived

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