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thre·o·nine | \ ˈthrē-ə-ˌnēn 
\
\Definition of threonine
: a colorless crystalline essential amino acid C4H9NO3
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threonine
nounthre·o·nine | \ ˈthrē-ə-ˌnēn \
\Medical Definition of threonine
: a colorless crystalline essential amino acid C4H9NO3 that is found in various proteins
—abbreviation Thr
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The first known use of threonine was in 1936
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