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iso·va·ler·ic acid | \ ˌī-sō-və-ˌlir-ik- 
, -ˌler- \
, -ˌler- \Medical Definition of isovaleric acid
: a liquid acid C5H10O2 that has a disagreeable odor, that occurs especially in valerian root in the free state and in some essential oils and marine-animal oils in the form of esters, and that is used chiefly in making esters for use in flavoring materials
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