Source : Webster's Revised Unabridged Dictionary (1913)

Physicochemical \Phys`i*co*chem"ic*al\, a. [Physico- +
   chemical.]
   Involving the principles of both physics and chemistry;
   dependent on, or produced by, the joint action of physical
   and chemical agencies. --Huxley.

Source : WordNet®

physicochemical
     adj : relating to physical chemistry