Abbott-Smith Manual Greek Lexicon
σαββατισμός (G4520)
1 *† σαββατισμός , -οῦ, ὁ ( σαββατίζω , to keep the sabbath, Ex 16:30 , al.), a keeping sabbath, a sabbath rest : metaph., as in Mishna (Zorell, s.v.), He 4:9 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain