A

David

Darling

locus

In genetics, the locus is the position on a chromosome where a specific gene is located.

 

In mathematics, a locus is 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.')