| caducean | (adjective) of or relating to a caduceus | - |
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| cetacean | (adjective) of or relating to whales and dolphins etc | Synonyms: cetaceous |
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| (noun) large aquatic carnivorous mammal with fin-like forelimbs no hind limbs, including: whales, dolphins, porpoises, narwhals | Synonyms: blower, cetacean mammal |
| crustacean | (adjective) of or belonging to the class Crustacea | Synonyms: crustaceous |
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| (noun) any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton | - |
| 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 |
| subocean | (adjective) formed or situated or occurring beneath the ocean or the ocean bed | Synonyms: suboceanic |
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| testacean | (noun) any of various rhizopods of the order Testacea characterized by having a shell | - |
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