ethologyPronunciation: /iːˈθɒlədʒi/Definition of ethology noun [mass noun] the science of animal behaviour. the study of human behaviour and social organization from a biological perspective. Derivatives ethologicalPronunciation: /iːθəˈlɒdʒɪk(ə)l/ adjective ethologist noun Origin: late 19th century: via Latin from Greek ēthologia, from ēthos (see ethos)ethology in other Oxford dictionaries Definition of ethology in the US English dictionary