locus
lo.cus \'lo--k*s\ \'lo--.si-, -.ki-, -ke-\ n or lo.ci [L - more at STALL] pl 1: PLACE, LOCALITY 2: the set of all points whose location is determined by stated conditions
Webster's English Dictionary Webster's English Dictionarylo.cus \'lo--k*s\ \'lo--.si-, -.ki-, -ke-\ n or lo.ci [L - more at STALL] pl 1: PLACE, LOCALITY 2: the set of all points whose location is determined by stated conditions