Definition of abyssal adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//əˈbɪsl//
; NAmE NAmE//əˈbɪsl//
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relating to the bottom of the ocean, especially to depths of between 3 000 and 6 000 metres Word Originmid 17th cent.: from late Latin abyssalis ‘belonging to an abyss’ from Greek abussos ‘bottomless’, from a- ‘without’ + bussos ‘depth’.
See the Oxford Advanced American Dictionary entry: abyssal