| ocean | (noun) a large body of water constituting a principal part of the hydrosphere | - |
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| (noun) anything apparently limitless in quantity or volume | Synonyms: sea |
| oceanaut | (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: aquanaut |
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| oceanfront | (noun) land bordering an ocean | - |
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| oceanographer | (noun) a scientist who studies physical and biological aspects of the seas | - |
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| oceanography | (noun) the branch of science dealing with physical and biological aspects of the oceans | Synonyms: oceanology |
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| oceanology | (noun) the branch of science dealing with physical and biological aspects of the oceans | Synonyms: oceanography |
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