Dictionary entry

στεῖρος

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

στεῖρος, -ον also -α, -ον,

[in LXX for עֲקֶרֶת, עֲקָרָה;]

barren: of a woman, Lk 1:7, 36 23:29, Ga 4:27^(LXX).†