Akkadian

parāsu - to stop, cut off, to staunch; to decide; to apportion, to divide a number, a whole (CAD P 165, AHw. 830)

Derived words: parištu ‘post-menopausal woman’ (CAD P 187); parrasu ‘one half’ (CAD P 189); parsu ‘division, fraction’ (CAD P 193, AHw. 835, SAD I); pirištu ‘secret plot, secret matter’ (CAD P 398, AHw. 866); pirsātānītu ‘woman sharing the secret knowledge, female initiate’ (SAD I); pirsu ‘weaned boy’ (CAD P 412, AHw. 867); pirsu ‘division’ (CAD P 411, AHw. 855); pirsu ‘breach’ (CAD P 414, AHw. 855); purrusātu ‘animal pen’ (CAD P 522); purussu ‘plug, stopper’ (CAD P 529, AHw. 142); purussû ‘(legal) decision, resolution’ (CAD P 529, AHw. 882); purustu ‘division’ (SAD I); pitruštu ‘ambiguous omen or feature’ (CAD P 442, AHw. 870); pitrusu ‘ambiguous’ (CAD P 442, AHw. 870); tapristu ‘division, distribution’ (CAD T 193).

PS
*prs - to tear, to cut (EDA I)