Neptunigender is a xenogender that is in some way related to or influenced by the planet Neptune. This includes any of the following:
- A gender related to the planet Neptune.
- A gender influenced by the planet Neptune.
- A gender influenced by a kintype to the planet Neptune.
- A gender related to the Greek god Poseidon or the Roman god Neptune.
- A gender influenced by one’s devotion to any of the aforementioned gods.
- A gender that is best explained or identified using the planet Neptune.
Neptunigender can also be used as a prefix for other genders, for example, neptuniboy, neptunigirl, neptuninonbinary, etc...
Neptunigender was coined on or before October 9, 2018 by Tumblr user neo-identity.