Quick Definition
a storm, tempest
Strong's Definition
Derivation: from G2380 (θύω) (in the sense of blowing) a storm
KJV Usage: tempest
Thayer's Greek Lexicon
θύελλα, θυελλης, ἡ (θύω to boil, foam, rage, as ἄελλα from ἄω, ἄημι), a sudden storm, tempest, whirlwind: Heb_12:18. (Deu_4:11; Deu_5:22; Homer, Hesiod, Tragg., others) (Cf. Schmidt, chapter 55, 11; Trench, § 73 at the end.)
Mounce Concise Greek Dictionary
θύελλα thuella 1x
a tempest, whirlwind, hurricane, Heb_12:18
Abbott-Smith Greek Lexicon
θύελλα , -ης , ἡ
( < θύω ),
[in LXX Deu_4:11 ; Deu_5:22 ( H6205 ) , Exo_10:22 * ;]
(poλt. in cl .),
a hurricane, cyclone, whirlwind: Heb_12:18 .†
SYN.: λαίλαψ G2978 ( q.v. ).
Liddell-Scott — Intermediate Greek Lexicon
θύελλα θύελλα, ἡ, [Etym: θύω, as ἄελλα from ἄημι] "a furious storm, hurricane", Hom. ; πυρὸς θύελλαι "thunderstorms", Od. ; ποντία θ. Soph. ; metaph., ἄτης θύελλαι Aesch.
STEPBible — Tyndale Abridged Greek Lexicon
θύελλα, -ης, ἡ
(θύω), [in LXX Deu.4:11 5:22 (עֲרָפֶל), Exo.10:22 * ;] (poët. in cl.),
a hurricane, cyclone, whirlwind: Heb.12:18.†
SYN.: λαίλαψ (which see) (AS)