Caustigender is a xenogender that feels acidic and gradually dissolves all other genders until it is the only gender, or only fully intact gender remaining.
Caustigender was coined by Tumblr user mephitic-malebolge on June 20, 2016.
The flag was designed by the coiner on the same day of coining. The color meanings are currently unknown.
The first alternate flag is a simplified version of the original and was designed by Mod Hermy on Tumblr account Pride-Color-Schemes on July 31, 2016. The color meanings are described as: "Likely green because it’s the color of acid."
The second flag's designer is currently unknown, but the flag was designed sometime before January 18, 2021. The color meanings are currently unknown.
The prefix "causti-" was likely taken from the English word "caustic" which means "able to burn or corrode by chemical action."
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