“Natural science” in Japanese
Short answer
Natural science in Japanese is “自然科学” (shizenkagaku). Full meaning: natural science.
Other ways to say “Natural science” in Japanese
理科
rika science (inc. mathematics, medicine, etc.), natural science; science department (university), science course; science (as a school subject)
理学
rigaku physical science, natural science; physics; lixue (Song-era Chinese philosophy)
ナチュラルサイエンス
nachurarusaiensu natural science
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