| 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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| crustacean | (adjective) of or belonging to the class Crustacea | Synonyms: crustaceous |
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| oceangoing | (adjective) used on the high seas | Synonyms: seafaring, seagoing |
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| oceanic | (adjective) relating to or occurring or living in or frequenting the open ocean | Synonyms: pelagic |
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| (adjective) constituting or living in the open sea | - |
| (adjective) resembling the ocean in apparent limitlessness in extent or degree | - |
| subocean | (adjective) formed or situated or occurring beneath the ocean or the ocean bed | Synonyms: suboceanic |
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| suboceanic | (adjective) formed or situated or occurring beneath the ocean or the ocean bed | Synonyms: subocean |
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| transoceanic | (adjective) on or from the other side of an ocean | - |
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