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oceanaut
oceanborne
oceanfront
oceangoing
Oceania
Oceanic
oceanic
oceanic ridge
oceanic trench
Oceanid
oceanography
oceanology
Oceanside
Oceanus Procellarum
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oceanic trench
o·ce·an·ic trench (plural o·ce·an·ic trench·es)


noun 
Definition:
 
canyon on sea bottom: a long narrow deep furrow in the Earth's crust at the bottom of an ocean
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