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WordReference Random House Unabridged Dictionary of American English © 2024nep•tune (nep′to̅o̅n, -tyo̅o̅n),USA pronunciation n. - Invertebratesany whelk of the genus Neptunea, esp. N. decemcostata, common along the eastern coast of North America and having a shell with seven to ten raised reddish-brown spiral ridges on a pale beige or yellow background.
- Neo-Latin Neptunea; see Neptune, -ea
- Mythologythe ancient Roman god of the sea, identified with the Greek god Poseidon.
- the sea or ocean:Neptune's mighty roar.
- Astronomythe planet eighth in order from the sun, having an equatorial diameter of 30,200 mi. (48,600 km), a mean distance from the sun of 2794.4 million mi. (4497.1 million km), a period of revolution of 164.81 years, and two moons. See table under planet (def. 1).
- Place Namesa township in E New Jersey. 28,366.
Collins Concise English Dictionary © HarperCollins Publishers:: Neptune /ˈnɛptjuːn/ n - the Roman god of the sea
Greek counterpart: Poseidon
Neptune /ˈnɛptjuːn/ n - the eighth planet from the sun, having eight satellites, the largest being Triton and Nereid, and a faint planar system of rings or ring fragments. Mean distance from sun: 4497 million km; period of revolution around sun: 164.8 years; period of rotation: 14 to 16 hours; diameter and mass: 4.0 and 17.2 times that of earth respectively
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