noun
Neptune
NEHPT-yoon
noun
1
The eighth and outermost planet in the solar system, known for its deep blue color.
"Neptune takes about 165 Earth years to orbit the sun."
2
In Roman mythology, the god of the sea, equivalent to the Greek god Poseidon.
"Ancient sailors prayed to Neptune before setting out on long voyages."
How to Use Neptune
Learner’s notesIn plain EnglishEither the blue ice-giant planet farthest from the sun, or the Roman god of the ocean.
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_____ takes about 165 Earth years to orbit the sun.
Etymology
From Latin Neptūnus, the Roman god of the sea, possibly linked to an ancient root meaning "wet" or "cloudy."