The Collaborative International Dictionary of English v.0.48:

biochemical \bi`o*chem"ic*al\ adj.
   of or pertaining to biochemistry.
   [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

biochemical \bi`o*chem"ic*al\ n.
   a chemical substance produced by a living organism, or such a
   substance produced synthetically.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

biochemical
    adj 1: of or relating to biochemistry; involving chemical
           processes in living organisms

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "biochemical":
   acid, acidity, agent, alkali, alkalinity, alloisomer, anion,
   antacid, atom, base, basic, cation, chemical, chemical element,
   chemicobiological, chemicoengineering, chemicomineralogical,
   chemicophysical, chemurgic, chromoisomer, compound, copolymer,
   copolymeric, copolymerous, dimer, dimeric, dimerous,
   electrochemical, element, elemental, elementary, heavy chemicals,
   heteromerous, high polymer, homopolymer, hydracid,
   inorganic chemical, ion, isomer, isomerous, macrochemical,
   macromolecule, metamer, metameric, molecule, monomer, monomerous,
   neutralizer, nonacid, organic chemical, oxyacid, photochemical,
   physicochemical, phytochemical, polymer, polymeric, pseudoisomer,
   radical, radiochemical, reagent, sulfacid, thermochemical,
   trimer