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pro·pi·on·ic acid | \ ˌprō-pē-ˈä-nik- 
\
\Definition of propionic acid
: a liquid sharp-odored fatty acid C3H6O2 found in milk and distillates of wood, coal, and petroleum and used especially as a mold inhibitor and flavoring agent
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propionic acid
nounpro·pi·on·ic acid | \ ˌprō-pē-ˌän-ik- \
\Medical Definition of propionic acid
: a liquid sharp-odored fatty acid C3H6O2 found in milk and distillates of wood, coal, and petroleum
— called also propanoic acid
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The first known use of propionic acid was in 1850
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