| ̷ ̷ ̷ ̷ at iso- + noun
Etymology: International Scientific Vocabulary is- + leucine
: a crystalline amino acid C 2 H 5 CH(CH 3 )CH(NH 2 )COOH that is isomeric with leucine, that occurs in its dextrorotatory l- form in most dietary proteins but is usually obtained from the waste from the recovery of sugar from beet molasses, and that like leucine is essential in the nutrition of animals and man; α-amino-β-methyl-valeric acid