Brook

a torrent.

(1.) Applied to small streams, as the Arnon, Jabbok, etc., Isaiah (Isa 15:7 ) speaks of the "book of the willows," probably the Wady-el-Asha.

(2.) It is also applied to winter torrents (Job 6:15; Num 34:5; Josh 15:4; 15:47), and to the torrent-bed or wady as well as to the torrent itself (Num 13:23; 1Kings 17:3).

(3.) In (Isa 19:7 ) the river Nile is meant, as rendered in the Revised Version.

EBD - Easton's Bible Dictionary