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The Collaborative International Dictionary of English v.0.48 (gcide)

Locus \Lo"cus\, n.; pl. {Loci}, & {Loca}. [L., place. Cf.
{Allow}, {Couch}, {Lieu}, {Local}.]
1. A place; a locality.
[1913 Webster]

2. (Math.) The line traced by a point which varies its
position according to some determinate law; the surface
described by a point or line that moves according to a
given law.
[1913 Webster]

{Plane locus}, a locus that is a straight line, or a circle.


{Solid locus}, a locus that is one of the conic sections.
[1913 Webster]