Relating to or living in the deepest parts of the ocean near the sea floor, especially at extreme depths.
From archi- (primitive, original, extreme) + benthal (relating to the sea bottom). Benthal comes from Greek benthos (depth of the sea), combining with the -al suffix to form an adjective.
The archibenthal zone is where Earth's weirdest creatures live—giant squid, anglerfish, and organisms we've barely studied—and scientists use 'archi-' to mean these extreme depths are where ancient, primitive forms of life are most likely to survive unchanged.
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