This root form (lemma) is used in 2 different forms in the NT: ἐσόπτρου (GNS), ἐσόπτρῳ (DNS).
It is glossed in 1 way: ‘a mirror’.
OET 1COR 13:12 Greek word=ἐσόπτρου (esoptrou) Morphology=GNS English gloss=‘a mirror’ SR GNT 1COR 13:12 word 5
OET JAM 1:23 Greek word=ἐσόπτρῳ (esoptrōi) Morphology=DNS English gloss=‘a mirror’ SR GNT JAM 1:23 word 21