PCS

*byṣ̂ - to be white, bright, yellow (Kogan 2015: 175)

see also *bayṣ̂-at- - ‘egg’

Arabic
ˀabyaḍ- - white (Lane 282)
may be internally derived from bayḍ- ‘egg’; it is also tempting to compare it to Gez. beṣā, Amh. bəč̣a ‘yellow’
Geez
beṣā - yellow (CDG 116)
Tigre
bäyyäṣä - to be bright, brilliant (CDG 116)
Amharic
bəč̣a - yellow (CDG 116)