Lexical Definition

‎ὄμβρος‎ ómbros (om'-bros) rainstorm ^G:N-M
of uncertain affinity

shower.

• a thunder storm

Abbott-Smith

ὄμβρος, -ου, ὁ, [in LXX: De 32:2 (שָׂעִיר), Wi 16:16, al.;]
a storm of rain, a shower: Lk 12:54.†

Abbott-Smith References

Liddell-Scott-Jones

ὄμβρος, ὁ,

__A storm of rain, thunder-storm, sent by Zeus, ὅτ᾽ ἐπιβρίσῃ Διὸς ὄ. [Refs 8th c.BC+]; of a storm at sea, [Refs 7th c.BC+]; distinct from ὑετός or common rain, [Refs 4th c.BC+]; but sometimes, heavy rain, [Refs 5th c.BC+]: in plural, rains, ὄ. πολλοὶ καὶ λάβροι [Refs 5th c.BC+]
__A.2 generally, water, as an element, μήτε γῆ, μήτ᾽ ὄ. ἱερός, μήτε φῶς [Refs 5th c.BC+]urine, [Refs 3rd c.AD+]
__A.3 inundation, τῶν παρακειμένων ὑδάτων [Refs 2nd c.BC+]; ὀχετοὺς ἀγαγεῖν οἳ ἄξουσιν τὸν ὄ. εἰς τὰς ἐξαγωγούς [Refs 3rd c.BC+]
__A.II metaphorically, storm, shower, ἐν πολυφθόρῳ Διὸς ὄ., of a battle, [Refs 5th c.BC+]; μέλας ὄ. χάλαζά θ᾽ αἱματοῦσσ᾽ (χαλάζης αἵματος codices) [Refs 5th c.BC+]