薬缶頭: bald head

お好み焼き: okonomiyaki, a type of pan-fried batter cake including a mixture of vegetable and beef, pork, or seafood

飛躍: leaping / 秘薬: secret medicine

飛躍: to make a leap forward

通約: (mathematics) fractional reduction, reduction of a fraction to its lowest denominator / 通訳: interpreting, interpretation (of the spoken word); an interpreter

通約: (mathematics) to reduce a fraction to its lowest denominator / 通訳: to interpret (the spoken word)

役に立つ: be useful, help

野狐禅: someone who has not fully attained enlightenment, but puts on airs and becomes self-important as if they have

薬学: pharmacy

銅鑼焼き: a kind of confection consisting of two small cakes baked to resemble gongs, sandwiching a filling of sweet azuki bean paste