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Definition of Hadal
1. Adjective. Relating to the deepest parts of the ocean (below 6000 meters). 
Partainyms: Seabed
Definition of Hadal
1. pertaining to deep parts of the ocean [adj]
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1. Adjective. Relating to the deepest parts of the ocean (below 6000 meters). 
1. pertaining to deep parts of the ocean [adj]