The Pali Text Society's Pali-English dictionary
Papā,(f.) [Ved.prapā,pa+pā] a place for supplying water,a shed by the roadside to provide travellers with water,a well,cistern D.III,185; S.I,33=Kvu 345 (=pānīyadāna-sālā SA); S.I,100 (read papañ ca vivane); J.I,109; DhA.III,349=J.I,302 (=pānīya-cāṭī C.); Vv 5222 (+udapāna); Pv.II,78 (n.pl.papāyo=pānīya-sālā PvA.102); II,925 (+udapāna).(Page 413)
Concise Pali-English Dictionary by A.P. Buddhadatta Mahathera
(f.)
a shed by the roadside to provide travellers with water.
Pali-Dictionary Vipassana Research Institute
papā:A shed on the roadside where travellers are supplied with water