Wiktionary:Word of the day/September 29

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Neptunian adj

(Roman mythology) Of or pertaining to Neptune, the Roman god of fresh water and the sea, the counterpart of the Greek god Poseidon. (by extension, rare) Of or pertaining to water or the sea. (by extension, geology) Formed by the action of water. (by extension, geology, historical) Of, pertaining to, or supporting Neptunism (“a discredited theory that rocks were formed from the crystallisation of minerals in the early Earth's oceans”). [...] (astrology) Pertaining to the astrological influence of the planet Neptune. (astronomy) Of or pertaining to the planet Neptune. To mark the premiere of English composer Gustav Holst’s orchestral suite The Planets on 29 September 1918, we are featuring a series of words relating to the planets in the Solar System. One of the suite’s movements is Neptune, the Mystic, which was composed in 1915.

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