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]

Source: 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).

Source: Webster's Revised Unabridged Dictionary (1913)