Jisho

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Noun
1. negative ionWasei, word made in Japan, From English “minus ion”. Wasei (word made in Japan)
Wikipedia definition
2. Negative air ionization therapyNegative air ionization therapy is the use of air ionisers as an experimental non-pharmaceutical treatment for seasonal affective disorder (SAD) and mild depression. For SAD, a randomized controlled trial (RCT) comparing high (4.5x10 ions/second) and low (1.7x10 ions/second) flow rate negative air ionization with bright light therapy found that posttreatment improvement results were 57.1% for bright light (10,000 lux) compared with high-density ions, 47.9%; and low-density ions, 22.7%.
Read “Negative air ionization therapy” on English Wikipedia
Read “マイナスイオン” on Japanese Wikipedia
Read “Negative air ionization therapy” on DBpedia
Other forms
マイナス・イオン

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