systematics
sys.tem.at.ics \-'mat-iks\ n pl but sing in constr 1: the science of classification 2: a system of classification; also : the classification and study of organisms with regard to their natural relationships : TAXONOMY
sys.tem.at.ics \-'mat-iks\ n pl but sing in constr 1: the science of classification 2: a system of classification; also : the classification and study of organisms with regard to their natural relationships : TAXONOMY