| a-1 |
a prefix that means "on," "at," "into," or "to." |
| aboard |
on or into a ship, plane, bus, or plane; on board. [1/2 definitions] |
| accept |
to allow into a group. [1/4 definitions] |
| accepted |
welcomed into a group or society; approved. [1/2 definitions] |
| acupuncture |
the practice of relieving pain or curing a disease by putting needles into certain parts of the body. Acupuncture is a traditional way to treat disease in China. |
| adobe |
a building material of clay mixed with straw that has been dried by the sun and made into bricks. [1/2 definitions] |
| air pressure |
the force of air on things. Air pressure has to do with how much force air has when it has been compressed into a space like a tire. It is also the pressure of the earth's atmosphere. |
| Alps |
a high mountain range that goes from southern France through Switzerland, Italy, Germany, and Austria and into the countries along the Adriatic Sea down to Albania. |
| analysis |
the process of separating something into parts in order to study it. [1/2 definitions] |
| analyze |
to separate into parts for close study; examine and explain. |
| annual ring |
one of the rings of wood on the inside of a tree that can be seen when the tree is cut into logs. Each ring represents a year of growth. |
| anvil |
a heavy metal block with a flat top on which heated metal objects are hammered into shapes. |
| apart |
into pieces. [1/2 definitions] |
| appear |
to come into view; become visible. [1/3 definitions] |
| appearance |
the act or an instance of coming into view or appearing. [1/4 definitions] |
| Arabian Desert |
a very dry region that covers a large part of Saudi Arabia, Yemen, and Oman, and stretches into Jordan and Iraq. |
| Aral Sea |
formerly, a very large, single lake in Central Asia. Once one of the world's largest lakes, the Aral Sea has lost a great deal of its water in recent times and it has divided into separate parts. The southeastern part of the Aral Sea has become entirely dry and is called a desert now. |
| arise |
to appear; come into being. [1/3 definitions] |
| aristocracy |
a class of people who have a high social position because of the family they are born into. Members of the aristocracy are usually richer and have more privileges than other members of society. [2 definitions] |
| artificial respiration |
the forcing of air into and out of the lungs of a person who has stopped breathing. |
| asbestos |
a mineral that separates into fibers and does not catch fire or conduct electricity. Asbestos is used to make fireproof materials and insulation. |