biosystematics Syllabification: (bi·o·sys·tem·at·ics)Pronunciation: /ˌbīōˌsistəˈmatiks/Definition of biosystematics noun [treated as singular] taxonomy based on the study of the genetic evolution of plant and animal populations. Derivatives biosystematistPronunciation: /-ˈsistəməˌtist/ noun biosystematics in other Oxford dictionaries Definition of biosystematics in the British & World English dictionary