Lexical Definition

‎ἔσοπτρον‎ ésoptron (es'-op-tron) mirror G:N-N
from ‎εἰς‎ and a presumed derivative of ‎ὀπτάνομαι‎

glass.

Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
ἐσόπτρῳ a mirror Jas.1.23
ἐσόπτρου a glass 1Cor.13.12

Abbott-Smith

** ἔσ-οπτρον, -ου, ὁ [in LXX: Wi 7:26, Si 12:11 * ;]
a mirror: I Co 13:12, Ja 1:23.†

Abbott-Smith References

Book Refs
1 Corinthians 13:12
James 1:23

Liddell-Scott-Jones

ἔσοπτρον

(so [Refs 3rd c.AD+], mostly in the form ἔσοπτρον, τό, (ὄψομαι) looking-glass, mirror, [Refs 5th c.BC+]