noun
negative ion; anion
Wasei-eigo term for negative ions, often associated with health benefits in popular culture. In scientific contexts, 陰イオン (in-ion) is preferred.
wasei-eigo (Japanese-coined English), from minus ion
この空気清浄機はマイナスイオンを発生させる。
This air purifier generates negative ions.
滝の近くはマイナスイオンが多
There are a lot of negative ions near the waterfall, and it feels good.