uroborosPronunciation: /ˌjʊərə(ʊ)ˈbɒrəs/ (also ouroboros)Definition of uroboros noun a circular symbol depicting a snake, or less commonly a dragon, swallowing its tail, as an emblem of wholeness or infinity. Derivatives uroboric adjective Origin: 1940s: from Greek (drakōn) ouroboros '(snake) devouring its tail'uroboros in other Oxford dictionaries Definition of uroboros in the US English dictionary