aboralPronunciation: /abˈɔːr(ə)l/Definition of aboral adjective Zoology relating to or denoting the side or end that is furthest from the mouth, especially in animals that lack clear upper and lower sides such as echinoderms: the aboral surface moving or leading away from the mouth. Derivatives aborally adverb aboral in other Oxford dictionaries Definition of aboral in the US English dictionary