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Children's Dictionary
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sea gull a gull that lives on or near the sea.
seahorse a small fish that swims with its head facing forward, but with its body and tail hanging down. Sea horses live in warm parts of the ocean. They use their curly tails to hang onto water plants.
seal1 a design that is stamped on wax or other soft material. Seals are used to make a document authentic or official. [5 definitions]
seal2 a mammal that spends most of its life in the ocean. Seals are a kind of pinniped, or mammal with flippers instead of feet. Various kinds of seals live in both warm and cold parts of the world's oceans. A few kinds live in fresh water. Seals are carnivores that eat fish and sea birds. They are closely related to sea lions and walruses.
sea level the surface level of the sea, halfway between high and low tide. It is used as the starting point for measuring elevations and depths.
sea lion a mammal that spends most of its life in the ocean. Sea lions are a kind of pinniped, or mammal with flippers instead of feet. Various kinds of sea lions live on the coasts of the Pacific Ocean. Sea lions are carnivores that eat fish and squid. They are closely related to seals and walruses.
seam a line formed by sewing two pieces of fabric together. [3 definitions]
sea otter a mammal with thick brown fur, a long body, a flat tail, and short legs. Sea otters live mostly in the Pacific Ocean in areas near the coast of California and Alaska.
seaplane an airplane that can land on and take off from water.
seaport a city, town, or harbor where ships that travel on the sea can dock, load, and unload.
search to look through very carefully in order to find something. [2 definitions]
searchlight a lamp that can direct a powerful beam of light in any direction.
seashell the shell of an oyster, clam, or other sea animal. Seashells are often found washed up on shore.
seashore land that borders on the ocean.
seasick feeling sick and dizzy from the rolling motion of a boat.
season one of the four parts of the year; spring, summer, fall, and winter. [4 definitions]
seasonal having to do with the seasons or a particular season of the year.
seasoning something that is added to food to make it taste better. Salt, herbs, and spices are seasonings.
seat a chair, bench, or other object for sitting on. [6 definitions]
seat belt a strap or belt that holds a person in the seat of a car, airplane, or other vehicle. Seat belts protect people against a sudden stop or crash.
sea turtle a large turtle that lives mostly in the sea. Sea turtles have long legs that are wide and flat so that swimming is easy. Sea turtles come onto the land to lay their eggs.