Relating to or inhabiting the deep ocean water that is cold year-round, particularly below the thermocline where temperature remains low.
From Greek 'cheimon' (winter/cold) + 'pelagic' (relating to the open ocean). This technical oceanographic term describes the perpetually cold depths of the ocean, contrasting with warmer surface waters.
The ocean's depths maintain winter-like cold year-round—creatures in chimopeelagic zones have evolved bioluminescence and other wild adaptations to survive in permanent darkness and cold that would kill surface organisms instantly.
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