The Collaborative International Dictionary of English v.0.48:

Oxybenzoic \Ox`y*ben*zo"ic\, a. [Oxy
   (b) + benzoic.] (Chem.) Hydroxybenzoic; pertaining to, or
       designating, any one of several hydroxyl derivatives of
       benzonic acid, of which the commonest is salicylic acid.
       [1913 Webster]