Comment: Cf. also Tab. Düb. baIṭur 'dirt', Ag. Bursh. (with reduplication) baIṭaṭaj "sheep's dung" (both forms point to PL pharyngealisation). Tab., Ag. and Rut. reflect a suffixed form with PL *-Vr (plural suffix). Initial p- in Rut. and Bud. is irregular: probably a result of assimilation.
The vowel variation probably reflects the old Ablaut *p:aIṭ (dir. stem), *p:oIṭV- (obl. stem).