the 4th-century-BC De Mundo of the Aristotelian Corpus . [204] It is traditionally derived from the proposed Proto-Indo-European root *albho- ("white"), in reference to the cliffs of Dover visible from the European continent, [205] but may also derive from proposed Proto-Celtic *Alb-i̯en- (cognate with Gaelic albio , "world" or "land"), proposed Proto-Indo-European *alb-