Where does “必須脂肪酸” come from?

必須脂肪酸 (Japanese) comes from Japanese 脂肪酸, from Japanese 酸, from Middle Chinese 酸.

必須脂肪酸 (Japanese): essential fatty acid

Definitions

  1. essential fatty acid

Ancestry of “必須脂肪酸”, step by step

必須脂肪酸 traces back through two separate lines of ancestry.

via Japanese 脂肪酸

StepLanguageWordMeaning
1Japanese脂肪酸fatty acid
2Japanese酸sourness; acid; Alternative spelling of 酢
3Middle Chinese酸—

via Japanese 必須

StepLanguageWordMeaning
1Japanese必須indispensability, a must
2Middle Chinese必須—
Every word from Middle Chinese 酸 →Every word from Japanese 酸 →Every word from Japanese 脂肪酸 →
必須脂肪酸 — Etymology, Origin & Word History | Etymology Explorer