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Definition of THREONINE
: a colorless crystalline essential amino acid C4H9NO3
Origin of THREONINE
probably from threonic acid (C4H8O5)
First Known Use: 1936
Medical Definition of THREONINE
: a colorless crystalline essential amino acid C4H9NO3 that is found in various proteins—abbreviation Thr
One of the essential amino acids. It occurs in the proteins of egg, milk, gelatin, and other biological substances and may be synthesized or obtained by hydrolyzing casein. It is used in nutritional and biochemical research and as a dietary supplement.