ringtailPronunciation: /ˈrɪŋteɪl/Definition of ringtail noun 1a ring-tailed cat or lemur. a female hen harrier or related harrier. a golden eagle up to its third year. 2 (also ringtail or ring-tailed possum) a nocturnal tree-dwelling Australian possum that habitually curls its prehensile tail into a ring or spiral. Genus Pseudocheirus and other genera, family Petauridae: several species ringtail in other Oxford dictionaries Definition of ringtail in the US English dictionary