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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]
sea feather any of several anthozoans that have a featherlike shape.
seafloor see seabed.
seafloor spreading the creation of new oceanic crust formed by an upward flow and outward spread of magma along mid-ocean ridges.
seafood any sea animal that is served as food or is suitable for eating.
sea front a part of a town or city on the edge of the sea, esp. a resort; waterfront.
seagirt surrounded by the sea.
seagoing intended or suitable for travel on the sea. [2 definitions]
sea green a pale bluish or yellowish green color.
sea gull a gull, esp. one that lives on or near the sea.
sea horse a small semitropical marine fish that swims in an upright position, with its head, resembling that of a horse, at right angles to its body.
sea-island cotton a type of long-fibered cotton grown in tropical America.
sea king any of the Viking pirate chiefs of medieval times.
seal1 a design, emblem, or embossed or impressed figure used to make a document authentic or official. [10 definitions]
seal2 any of a number of flesh-eating mammals that live in and around the ocean and have flippers instead of legs. [4 definitions]