Angiology – study of blood flow and lymphatic system Anthropobiology – study of human biology Anthropology – study of human cultures Aphnology – science of wealth Apiology – study of bees Arachnology – study of arachnids Archaeology – study of human material remains Archelogy – study of first principles Archology – science of the origins of government Arctophily – study of teddy bears Areology – study of Mars Aretaics – science of virtue Aristology – science or art of dining Arthrology – study of joints Astacology – science of crayfish Astheniology – study of diseases of weakening and aging Astrogeology – study of extraterrestrial geology Astrometeorology – study of effect of stars on climate Astronomy – study of celestial bodies Astrophysics – study of behaviour of interstellar matter Astroseismology – study of star oscillations Atmology – the science of aqueous vapor Audiology – study of hearing Autecology – study of ecology of one species Autology – scientific study of oneself Auxology – science of growth Avionics – science of electronic devices for aircraft Axiology – science of the ultimate nature of value