This root form (lemma) is used in 2 different forms in the NT: καθέδρας (AFP), καθέδρας (GFS).
It is glossed in 2 different ways: ‘seat’, ‘seats’.
OET MARK 11:15 Greek word=καθέδρας (kathedras) Morphology=AFP English gloss=‘seats’ SR GNT MARK 11:15 word 41
OET MAT 21:12 Greek word=καθέδρας (kathedras) Morphology=AFP English gloss=‘seats’ SR GNT MAT 21:12 word 28
OET MAT 23:2 Greek word=καθέδρας (kathedras) Morphology=GFS English gloss=‘seat’ SR GNT MAT 23:2 word 5