biosystematics,n.pl.(const.assing.)|ˌbaɪəʊsɪstəˈmætɪks|[f.bio- + systematicss.v.systematicn.2.]A branch of taxonomy based on the experimental study of the genetic and other properties of plant and animal populations.Orig.called biosyˈstematy n.(now rare).1943Camp & Gilly inBrittonia IV. 324It became evident that there is with us a new branch of the science of systematics—biosystematy—which we will later discuss.Ibid.327As here defined, Biosystematy seeks (1) to delimit the natural biotic units and (2) to apply to these units a system of nomenclature adequate to the task of conveying precise information regarding their defined limits, relationships, variability, and dynamic structure.1950Madroño X. 198There has recently come into prominence a new term, namely, Biosystematics.1951Brittonia VII. 113As was expected, the introduction of the term Biosystematy brought a series of protests.1951G. H. M. LawrenceTaxon.Vascular Plants viii. 172It is significant that the findings of taxonomy (classical as well as modern) and of biosystematics are of mutual importance.1963E. MayrAnimal Species & Evolution xiv. 401Some botanists have declared that the classification of specimens and the (experimental) study of natural populations were two independent branches of biology,..orthodox taxonomy and..‘genecology’ or ‘biosystematy’.1971Language XLVII. 867The intuitive notions of taxonomy and taxonomic structure formalized here are similar to those of biosystematics.1977P. B. & J. S. MedawarLifeSci.ii. 24The purpose of biosystematics is to name animals and to arrange their names in some order and pattern.Hence ˌbiosysteˈmatic a.; ˌbiosyˈstematist n., an expert in or student of biosystematics.1943Camp & Gilly inBrittonia IV. 333The biosystematist must have species which are not only recognizable as such but which are organized about a genetic system which is reasonably repetitive.Ibid.374It is certainly needful to note the presence of phenogenetic population segments in biosystematic analyses.1951G. H. M. LawrenceTaxon.Vascular Plants viii. 182The species..as conceived by the biosystematist, is a group of interbreeding or potentially interbreeding individuals reproductively isolated from other groups of individuals.1963Watsonia V. 304The present work is based on a biosystematic study of these taxa with particular reference to variation in morphology, habit and cytology.1970Nature 11 July 124/2Biosystematic work on the Middle East flora has developed rapidly during the past decade.1984Oxf.SurveysEvol.Biol.I. 69This has significance for the bio-systematist because in western peninsular Florida what seems to be this same species has lost part of its flicker.