sabbatarians

n. [ L. Sabbatarius: cf. F. sabbataire. See Sabbath. ] 1. One who regards and keeps the seventh day of the week as holy, agreeably to the letter of the fourth commandment in the Decalogue. [ 1913 Webster ]

☞ There were Christians in the early church who held this opinion, and certain Christians, esp. the Seventh-day Baptists, hold it now. [ 1913 Webster ]

2. A strict observer of the Sabbath. [ 1913 Webster ]

a. Of or pertaining to the Sabbath, or the tenets of Sabbatarians. [ 1913 Webster ]