Japanese

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Japanese Wikipedia has an article on:
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Kanji in this term
そう
Grade: 6
on'yomi
Alternative spelling
オゾン層 (kyūjitai)

Etymology

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オゾン (ozon, ozone) +‎ (, layer)

Pronunciation

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Noun

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オゾン(そう) (ozon-sō

  1. the ozone layer