Eronim (or Erongender) is a naturogender defined as "a silent, stoic gender, unmoveable but very slowly wearing away, in the same manner that a rockface slowly erodes over time.
Eronim can be used as “I’m eronim,” or “I’m an eronim.” Erongender can be used as “I’m erongender,” or, if experienced with another gender, as “I’m erongirl.” (for example). You can also use eronim in the same way (e.g., “I’m an eronim girl.”)."1

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History of the term

Eronim was coined on March 5, 2019 by tumblr user xeno-aligned. The flag was created at the same time.2

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