The word locus (plural loci) is Latin for "place": Locus (psychology), in industrial psychology, having an internal or external locus of control Locus (genetics), the position of a gene (or other significant sequence) on a chromosome Locus (mathematics), the set of points satisfying a particular condition, often forming a curve of some sort Locus (medicine), the "place" on the body where a pathogen enters Locus (phonetics), the hypothetical starting point of the formant transitions that char… (More on Locus)