seafowlEtymologyFrom Middle English sefoul, from Old English sǣfugol (“seabird”), equivalent to sea + fowl. Cognate with Dutch zeevogel, German Seevogel, Swedish sjöfågel, Icelandic sjófugl.seafowl means Any bird that spends most of its time in coastal waters or over the oceans. Lexicurio rates it Rare gem — a strength score of 74 out of 100.nounAny bird that spends most of its time in coastal waters or over the oceans.