Lexical Definition

‎ἀτμίς‎ atmís (at-mece') vapor ^G:N-F
from the same as ‎ἀήρ‎

vapour.

• mist

Abbott-Smith

ἀτμίς, -ίδος, ἡ, [in LXX for עָנָן, תִּימָרָה, etc.;]
vapour: Ja 4:14; ἀ. καπνοῦ, Ac 2:19(LXX).†

Abbott-Smith References

Liddell-Scott-Jones

ἀτμίς-ίς, ίδος

(-ίτος[ἀτμίςός}, 5th c.BC: Herodotus Historicus 4.75, 5th-6th c.BC: Plato Philosophus “Timaeus” 87a, 4th c.BC: Nicostratus Philosophus 15.5">Refs 5th c.BC+]: properly, moist vapour, steam, opposed to καπνός (but ἀτμίςὶς καπνοῦ[LXX+4th c.BC+]

__II sublimate or deposit of colouring matter, [Refs]
__III poultice, [Refs 1st c.AD+]
__IV ={σπινθήρ, ἀπαύγασμα}, [Refs 5th c.AD+]

_{LSJ Scripture Refs: LXX.Joel.2.30}