Abbott-Smith Manual Greek Lexicon
καθ-έδρα (G2515)
3 καθ-έδρα , -ας, ἡ ( κατά , + ἔδρα , a seat ), [in LXX for מוֹשָׁב and cogn. forms;] a chair , seat : Mt 21:12 , Mk 11:15 ; of teachers, Mt 23:2 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain