WordReference Random House Unabridged Dictionary of American English © 2020
i•so•leu•cine  (ī′sə lo̅o̅sēn, -sin),USA pronunciation n. [Biochem.]
  1. Biochemistrya crystalline amino acid, C6H13O2, occurring in proteins, that is essential to the nutrition of humans and animals. Abbr.: Ile;
    Symbol: I
  • iso- + leucine 1900–05

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