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Children's Dictionary
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siege a military act of surrounding a city or base, attacking it, and cutting off supplies. The goal of a siege is to force the city or fort to surrender.
sierra a chain of mountains with sharp peaks that look like the teeth of a saw.
Sierra Leone an African country on the Atlantic Ocean between the countries of Guinea and Liberia. The capital of Sierra Leone is Freetown.
sieve a tool used to separate solid from liquid or to separate smaller pieces of something from larger pieces. Sieves have small holes or wire mesh on the bottom.
sift to spread or sprinkle using a sieve or as though using a sieve. [2 definitions]
sigh to breathe out with a long breath because of being sad, tired, or relieved. [3 definitions]
sight the ability to see; vision. [7 definitions]
sightless not able to see; blind.
sightseeing the act or hobby of visiting and seeing interesting places; touring. [2 definitions]
sign something that shows or demonstrates a fact, event, or quality; indication. [7 definitions]
signal a movement, action, or device used to communicate instructions, warning, or other information. [7 definitions]
signature a person's written name, used to sign documents, letters, or checks. [2 definitions]
significance great value; importance. [2 definitions]
significant being or causing something of importance. [2 definitions]
sign up to join or cause to join a particular group, class, or activity; register.
silence a lack of sound; quiet. [3 definitions]
silent making no sound. [5 definitions]
silhouette an outline or side view of a person's head that is filled with a dark, solid color. [3 definitions]
silicon a hard, dark gray substance that is a chemical element. It is found in silica, a compound that makes up one fourth of the earth's crust. Silicon is used in making glass, concrete, bricks, and computer chips. (symbol: Si)
silk a fine, soft, shiny fiber produced by certain insects. [4 definitions]
silkworm a caterpillar of a moth, originally from Asia. The caterpillar makes silk thread that it uses to spin its cocoon. People use the cocoons to make silk cloth.