Ratanākara. A district in the Dakkhinadesa of Ceylon. Cv.lxix.31; for its identification see Cv. Trs.i.286, n.3.

Dictionary of Pali Proper Names, G P Malalasekera (1899-1973), which is available as printed version from

ratanākara : [m.] jewel-mine.

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