Dictionary entry

λεῖος

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

λεῖος, -εία, -εῖον,

[in LXX: Ge 27:11, I Ki 17:40 R (חָלָק, חַלּוּק); ὁδὸς λ., Is 40:4Α (בִּקְעָה); Pr 2:2012:1326:23*;]

smooth: opp. to τραχύς, Lk 3:5(LXX).†