WordNet (r) 3.0 (2006):

bionics
    n 1: application of biological principles to the study and
         design of engineering systems (especially electronic
         systems)

Moby Thesaurus II by Grady Ward, 1.0:

49 Moby Thesaurus words for "bionics":
   aerobiology, agrobiology, anatomy, astrobiology,
   automatic electronics, autonetics, bacteriology, biochemics,
   biochemistry, biochemy, bioecology, biological science, biology,
   biometrics, biometry, bionomics, biophysics, botany,
   cell physiology, circuit analysis, communication theory,
   cryobiology, cybernetics, cytology, ecology, electrobiology,
   embryology, enzymology, ethnobiology, exobiology, genetics,
   gnotobiotics, information theory, life science, microbiology,
   molecular biology, pharmacology, physiology, radio control,
   radiobiology, servo engineering, servomechanics,
   system engineering, systems analysis, systems planning, taxonomy,
   virology, xenobiology, zoology