'abyssopelagic' originates from Greek, specifically the word 'abyssos,' where 'a-' meant 'without' and 'byssos' meant 'bottom,' combined with 'pelagic' from 'pelagos' meaning 'sea.'

'abyssos' transformed into the modern English word 'abyss,' and 'pelagos' became 'pelagic,' eventually forming 'abyssopelagic.'

Initially, it meant 'without bottom sea,' but over time it evolved into its current meaning of 'relating to the deep ocean zone.'