Dictionary entry

σής

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament with Strong's

σής, σητός (late gen. for cl. σεός), ὁ,

[in LXX: Jb 4:19, Is 50:9 (עָשׁ), Is 51:8 (סָס), al.;]

a moth, clothes moth: Mt 6:19, 20, Lk 12:33.†