taḷāka : [m.; nt.] a lake.

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

Taḷāka (nt.) [Derivation uncertain. Perhaps from taṭa. The Sk. forms are taṭaka, taṭāka, taḍāga] a pond, pool, reservoir Vin ii.256; J i.4, 239; PvA 202; DA i.273; Miln 1, 66=81, 246, 296, 359.

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