n. & adj.
--n.
1. a strict sabbath-keeping Jew.
2 a Christian who favours observing Sunday strictly as the sabbath.
3 a Christian who observes Saturday as the sabbath.
--adj. relating to or holding the tenets of Sabbatarians.
Derivatives:
Sabbatarianism n.
Etymology: LL sabbatarius f. L sabbatum: see SABBATH