| 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. |
| Sikh |
a member of a Hindu religious sect formed in India around the year 1500. Sikhs have faith in one god only rather than in many gods. |
| 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. |