noun🔗ShareAn essential amino acid, C6H13NO2, isomeric with isoleucine, found in most animal proteins; it is essential for growth in children."To ensure he gets enough leucine, which is important for his growth, the doctor recommended a diet rich in protein for the young boy. "biochemistrybiologychemistrycompoundsubstancephysiologyfoodmedicinescienceChat with AIVocabulary GamePractice Reading