locus

(LOH-kuss) Specific place where something is located or occurs. It may refer to a specific place on the body (such as an acupuncture point) or the place on a chromosome where a specific gene is found.

Place or location.

(pl.: loci) A site on a chromosome.

The place on a chromosome where a specific gene is located, a kind of address for the gene. The plural is "loci," not "locuses." See also chromosome, gene