 The word "naulon" (ναῦλον) is defined by the Christian-era lexicographer Hesychius of Alexandria as the coin put into the mouth of the dead; one of the meanings of "danakē" (δανάκη) is given as "the obol for the dead".The Suda defines "danakē" as a coin traditionally buried with the dead for paying the ferryman to cross the river Acheron, and explicates the definition of "porthmēïon" (πορθμήϊον) as a ferryman’s fee with a quotation from the poet Callimachus, who notes the custom of carrying the "porthmēïon" in the "parched mouths of the dead.