Sīhassara. A king of long ago. Mhv.ii.13f.; Dpv.iii.42.

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

sīhassara : [adj.] having a voice like a lion.

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