ambrosiaPronunciation: /amˈbrəʊzɪə/Definition of ambrosia noun [mass noun] 1 Greek & Roman Mythology the food of the gods. something very pleasing to taste or smell:the tea was ambrosia after the slop I’d been suffering 2a fungal product used as food by ambrosia beetles. 3another term for bee bread.Derivatives ambrosial adjective Origin: mid 16th century: via Latin from Greek, 'elixir of life', from ambrotos 'immortal'ambrosia in other Oxford dictionaries Definition of ambrosia in the US English dictionary