a person who has taken an oath or sworn allegiance.
Origin: 1250–1300; Middle English jurour < Anglo-French (compare Old French jureur), equivalent to Old French jur(er) to swear (< Latin jūrāre) + -our-or2
late 14c. (attested from late 12c. in Anglo-L.), from Anglo-Fr. jurour (1292; O.Fr. jureor), from L. juratonem (nom. jurator) "swearer," agent noun from jurare "to swear" (see jury (n.)).