Asfaltos dicit grecus nos aspaltum.
The Greek says asfaltos and we say aspaltum.
Greek ἄσφαλτος /ásphaltos/ "asphalt, bitumen, (a kind of) petroleum, pitch", was adopted into Latin as asphaltus. There were a number of variants of the word in medieval Latin, e.g. aspaltum, aphaltum (Latham 1973). The originally Greek sound combination /sph-/ is sometimes rendered by Simon as /sp-/, cf. his entry Spagnos < Greek σφάγνος /sphágnos/.