vacca : [nt.] excrement; faeces; dung.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Vacca (nt.) [cp. BSk. vaccaḥ AvŚ i.254] excrement, faeces Vin ii.212; iv.229, 265; Vism 250 (a baby's); VbhA 232 (id.), 243; PvA 268. -- vaccaŋ osajjati, or karoti to ease oneself J i.3; PvA 268.
   -- kuṭī (& kuṭi) a privy Vin ii.221; J i.161; ii.10; Vism 235, 259, 261; VbhA 242; DhA ii.55, 56; PvA 266, 268. -- kūpa a cesspool Vin ii.221; J v.231; Vism 344 sq.; DhA i.180. -- ghaṭa a pot for excrements, chamber utensil, commode Vin i.157=ii.216; M i.207. -- doṇikā id. Vin ii.221. -- magga "the way of faeces," excrementary canal, opening of the rectum Vin ii.221; iii.28 sq., 35; J i.502; iv.30. -- sodhaka a privy -- cleaner, night -- man Mhvs 10, 91.

Pali-English Dictionary, TW Rhys Davids, William Stede,