| cetacean | (noun) large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales, dolphins, porpoises, narwhals | Synonyms: blower, cetacean mammal |
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| crustacean | (noun) any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton | - |
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| gallinacean | (noun) heavy-bodied largely ground-feeding domestic or game birds | Synonyms: gallinaceous bird |
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| larvacean | (noun) any member of the class Larvacea | - |
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| 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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| testacean | (noun) any of various rhizopods of the order Testacea characterized by having a shell | - |
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