Abbott-Smith Manual Greek Lexicon
ἔσ-οπτρον (G2072)
2 ** ἔσ-οπτρον , -ου, ὁ [in LXX: Wi 7:26 , Si 12:11 * ;] a mirror : I Co 13:12 , Ja 1:23 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain
Strong's G2072 · Greek
ἔσοπτρον
esoptron · es'-op-tron
from 1519 and a presumed derivative of 3700; a mirror (for looking into)