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sea anchor a large canvas-covered, often conical frame that is let out as a float or drag to prevent a ship from drifting off course or to keep it headed into the wind.
sea anemone a flowerlike sedentary sea polyp, the flexible cylindrical body of which is topped with one or more rings of tentacles that encircle a mouth.
sea animal any of various animals that live in the sea, including fish, invertebrates, and certain mammals.
sea bag a large cylindrical canvas duffle bag, used by sailors to carry clothing and other personal gear.
sea bass any of numerous marine food fishes that have large scales, spiny fins, and wide mouths. [2 definitions]
seabed the floor of an ocean or sea.
Seabee a member of the Civil Engineer Corps of the U.S. Navy that constructs harbor facilities, airfields, and the like (acronym for "Construction Battalion").
sea bird a bird that lives on or near the sea, such as a gull or albatross.
sea biscuit hardtack or ship biscuit.
seaboard a region along a seacoast.
seaborne carried on, over, or by the sea.
sea breeze a breeze that blows inland from the sea.
sea change any striking transformation or alteration, often an improvement. [2 definitions]
seacoast land that borders on the sea; seashore.
seacock a valve in the hull of a ship that controls the flow of outside water into the hull.
sea cow a large vegetarian sea mammal with flipperlike forelimbs, a blunt snout, and large lips, such as a dugong or manatee.
sea cucumber an echinoderm that has a long, leathery, cucumber-shaped body with a cluster of tentacles surrounding the mouth at one end.
sea dog an old experienced sailor. [2 definitions]
sea elephant an elephant seal.
seafarer someone who works on a seagoing boat; sailor. [2 definitions]
seafaring traveling by sea. [4 definitions]