Lexical Definition

‎עָרֹב‎ ʻârôb (aw-robe') swarm ^H:N-M
from ‎עָרַב‎

divers sorts of flies, swarm.

• a mosquito (from its swarming)

1) swarm
1a) probable meaning from 'mixture' and 'incessant or involved motion'

Brown-Driver-Briggs

‎עָרֹב‎₉ noun masculine^{Exod 8:20*} probably swarm (mixture, from incessant, involved motion; Lag^{BN 112 doubts}); — of plague of stinging flies, coming in a swarm (see Di^Ex) Exod 8:17* (twice in verse) + 5 t. 8(J), Ps 78:45; Ps 105:31.

Brown-Driver-Briggs References