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seam a line formed by sewing two pieces of fabric together. [3 definitions]
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 urchin a small sea animal with a soft body inside a hard, round shell. Its shell is covered with long, thin spines. Sea urchins are related to starfish.
seaweed a kind of alga that grows in salt water. [2 definitions]
sec. an abbreviation for second, or seconds.
secede to withdraw from a group or a political union.
secluded hidden away from view. [2 definitions]
second1 coming next after the first in a series. [6 definitions]
second2 a unit of time equal to one of the 60 equal parts of a minute. [2 definitions]
secondary not first in importance or value; less important.