also  va*le*ri*an*ic acid  n :  any of four isomeric fatty acids C₅H₁₀O₂ or a mixture of two or more of them:  a  :  a liquid normal acid that has a disagreeable odor and that is used in organic synthesis - called also pentanoic acid   b  :  ISOVALERIC ACID  c  :  a liquid acid existing in three optically isomeric forms and occurring usu. in the dextrorotatory form in a few essential oils  d  :  PIVALIC ACID .
 
 
 
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