Merriam-Webster Collegiate Dictionary - presbyterian

 I. noun  Date: 1640 a member of a ~ church  II. adjective  Date: 1641  1. often not capitalized characterized by a graded system of representative ecclesiastical bodies (as presbyteries) exercising legislative and judicial powers  2. of, relating to, or constituting a Protestant Christian church that is presbyterian in government and traditionally Calvinistic in doctrine  • ~ism noun