PCS

*pṣḥ - to be bright (Bulakh 2003: 45, Kogan 2011: 198)

Akk. peṣû ‘white’ may be related to this root

Akkadian
peṣû - white (CAD P 328, AHw. 857)
Derived words: pūṣāwūtu ‘laundry work’ (CAD P 538, AHw. 883); pūṣāyu ‘launderer’ (CAD P 538, AHw. 883); puṣāˀū (puṣû) ‘white’ (CAD P 328, AHw. 857); puṣīˀū, puṣû ‘white gold’ (CAD P 539, AHw. 883); puṣṣû ‘white’ (CAD P 539); pūṣu ‘white spot’ (CAD P 539, AHw. 883).
May be related to PCS *pṣḥ ‘to be bright’.
Hebrew
pṣḥ - to be bright (HALOT 953)
Jewish Babylonian Aramaic
pṣḥ - to be bright (DJBA 923)
Syriac
pṣḥ - to rejoice (LSyr. 587, SL 1218)
Mandaic
pṣiḥa - bright, clear, cheerful (MD 376)
Arabic
fṣḥ - to be bright (Lane 2403)