Lexical Definition

‎λαῖλαψ‎ laîlaps (lah'-ee-laps) storm ^G:N-F
of uncertain derivation

storm, tempest.

• a whirlwind (squall)

Abbott-Smith

λαῖλαψ, -απος, ἡ, [in LXX: Jb 21:18 27:20 א (סוּפָה) 38:1, Je 32 (25):32 (סְעָרָה, סַעַר), Wi 5:14, 23, Si 48:9, 12*;]
a hurricane, whirlwind: Mk 4:37, Lk 8:23, II Pe 2:17.†
SYN.: θύελλα, q.v., and cf. ἄνεμος.

Abbott-Smith References

Liddell-Scott-Jones

λαῖλαψ, ᾰπος, ἡ,

furious storm, hurricane, βαῖνον ἐρεμνῇ λαίλαπι ἶσοι [LXX+8th c.BC+], a whirlwind sweeping upwards: metaphorically, ἔτλης λαίλαπα δυσμενέων [Refs 1st c.BC+]—Not found in early Prose, but common later,[NT+1st c.AD+]:—a form λαιλαπετός, ὁ, occurs in [Refs 8th c.BC+]

_{LSJ Scripture Refs: LXX.Job.21.18 ☩ Mark.4.37}