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Borrowed from German Kaffein[1][2] or English caffeine.[1][2]
カフェイン • (kafein)
- caffeine
- ↑ 1.0 1.1 1.2 Matsumura, Akira, editor (2006), 大辞林 [Daijirin] (in Japanese), Third edition, Tokyo: Sanseidō, →ISBN
- ↑ 2.0 2.1 Matsumura, Akira (1995) 大辞泉 [Daijisen] (in Japanese), First edition, Tokyo: Shogakukan, →ISBN