Lewis Short
(adjective) : sabbătārĭus, a, um, sabbata
* Of or belonging to the Sabbath, Sabbatical: luxus,Sid. Ep. 1, 2 med.—Subst.: sabbă-tārĭi, ōrum, m., Sabbath-keepers, poet. for Jews, Mart. 4, 4, 7.
Charlton T. Lewis, Charles Short, A Latin Dictionary