(Aramaic) probably prolonged from 'el; lo! -- behold.
see HEBREW 'el
H431. alu
אֲלוּ Interjection lo! (derivation uncertain: usually regarded as by-form of אֲרוּ, q. v.; compare Egyptian Aramaic הלו, CookeNo.73, RES492 B = S-CM b); — וַאֲלוּ Daniel 2:31 וַאֲלוּ הֲוַיְתָ חָזֵי, 4:7; 4:10; 7:8 always in description of a vision.