a.1.(Chem.) Hydroxybutyric; designating any one of a group of metameric acids ((C3H6.OH).CO2H).
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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And he figured that if you didn't give them the fat which make the ketone bodies, they couldn't make oxybutyric acid and they couldn't get acidosis.