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locus



  1. (GENETICS) The position on a chromosome where a specific gene is located.

       • GENETICS AND HEREDITY


  2. (MATHEMATICS) The set of all points (usually forming a curve or surface) that satisfy some condition. For example, the locus of points in the plane equidistant from a given point is a circle. Plural is "loci". The Latin word locus simply means "place." (The Greek equivalent is topos, which crops up in "topology".)

       • GEOMETRY