Definitions

1. adjective

relating to or characteristic of Neptune, its moons, or the planet’s influence.

“The neptunian storm on the distant planet was a sight to behold.”

2. noun

a person or thing from Neptune or its system.

“The neptunian explorer spent years studying the icy moon of Triton.”

3. adjective

extremely cold or remote, often used to describe a place or environment.

“The neptunian landscapes on the frozen planet were a wonder to explore.”