oxybutyric

from The Collaborative International Dictionary of English v.0.48

Oxybutyric \Ox`y*bu*tyr"ic\, a. [Oxy
   (b) + butyric.] (Chem.) Hydroxybutyric; designating any one
       of a group of metameric acids ({(C3H6.OH).CO2H}).
       [1913 Webster]