I. ˈlü-th(ə-)rən noun
Date: 1521
: a member of a Lutheran church
II. adjective
Date: 1530
1. : of or relating to religious doctrines (as justification by faith alone) developed by Martin Luther or his followers
2. : of or relating to the Protestant churches adhering to Lutheran doctrines, liturgy, and polity
• Lu·ther·an·ism -rə-ˌni-zəm noun