Neptune proper n 🔊

1. (Roman mythology) The Roman god of earthquakes and the ocean, the counterpart of Poseidon in Greek mythology.
2. (by extension)
   1. A personification of the ocean.
   2. (astronomy) The eighth and furthest planet in the Solar System in terms of average distance from the Sun; an ice giant, by size it is the fourth largest planet. [...]

Neptune n

1. (nautical, historical) A sailor acting as Neptune (proper noun sense 1), the Roman god of the ocean, during a ceremony on board a ship when it is crossing the equator.

☞ The planet Neptune was first observed by the German astronomer Johann Gottfried Galle with a telescope on this day 180 years ago in 1846.

Sousse neptune.jpg

Neptune Voyager2 color calibrated.png

A mid-3rd-century mosaic of the Roman god Neptune (proper noun sense 1) in a chariot drawn by two seahorses.[n 1]

https://en.wiktionary.org/wiki/Wiktionary:Word_of_the_day/2026/September_23