LSJ
ου, ὁ, fem. ἀσφαλῖτις, ιδος, bituminous, βῶλος Str. 7.5.8; λίμνη Ἀ. the Dead Sea, D.S. 19.98, cf. J. BJ 1.33.5; πόα, = ἀσφάλτιον, Philum. ap. Orib. 45.29.27, Archig. ap. Aët. 5.84. v. ἀσφαλτίας.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)