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From Biology-Online Dictionary | Biology-Online Dictionary
noun, plural: loci
(general) A place, space or locality, especially a centre of an activity.
(mathematics) The set of all points whose coordinates satisfy a given equation or condition.
(genetics) The location of a gene (or of a significant sequence) on a chromosome, as in genetic locus.
(medicine) The site on the body where a pathogen enters.
Word origin: Latin stlocus, a place.