1. relating to the bottom of the ocean, especially to depths of between 3 000 and 6 000 metres
   Collocations: Abyssal is used with these nouns:

   • depth
   Word Originmid 17th cent.: from late Latin abyssalis ‘belonging to an abyss’ from Greek abussos ‘bottomless’, from a- ‘without’ + bussos ‘depth’.

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[TahlilGaran] English Dictionary ▲