The Collaborative International Dictionary of English v.0.48:

adipic acid \adipic acid\
   an aliphatic dicarboxylic acid (HO.CO.(CH2)4.CO.OH),
   containing six carbon atoms in a linear chain. It is found in
   beet juice. It is used in the manufacture of synthetic
   plastics such as Nylon, as well as other products.
   [PJC]