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| abdomen |
the part of the body between the chest and the hips. The abdomen contains the stomach, intestines, and liver. [2 definitions] |
| abscess |
a sore that forms within the tissues of the body and is filled with pus. Abscesses can be caused by an infection. |
| ache |
If you have a dull pain in some part of your body and the pain lasts a long time, it means that that part of your body aches. If you have dull pain in many parts of your body, it means that you ache. [1/4 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. |
| adapt |
When a person adapts to a new situation, they make changes in the way they think or the way they do things. They adapt so that they can live or be happier under new conditions. If a plant or animal adapts, it changes its body or behavior so that it can live under new conditions, such as having to live in a new place or in a different climate. [1/2 definitions] |
| adaptation |
a particular change in the body of a living thing that helps the animal or plant to survive under new conditions. An adaptation happens over a very long time. [1/4 definitions] |
| addiction |
If a person has an addiction, their body sends out signals that they must continue to take or take more of a certain a drug or similar substance. These signals cause a desire for the drug that is very, very strong, and it can make people do things that they would not normally do just to get it. Addiction is something that can ruin people's lives. Some drugs cause addiction, but most drugs that people take as medicine do not. |
| adjust |
When you adjust to something, your body or your mind gets used to it over time, or you make changes in yourself so that you fit in better. [1/2 definitions] |
| aerobic |
able to work the heart and lungs to help the body use oxygen better. |
| aerobics |
(used with a singular or plural verb) a form of exercise that works the heart and lungs to help the body use oxygen better. Running, swimming, biking, or dance are forms of aerobics. |
| against |
When you lean against a tree, it means that part of your body touches the tree, and the tree supports some of your body's weight. [1/4 definitions] |
| agony |
great or intense pain and suffering in the mind or body, usually over a long period of time. |
| AIDS |
a serious disease caused by a virus that stops the body from being able to protect itself from other diseases. "AIDS" stands for "acquired immune deficiency syndrome." |
| akimbo |
with hand on hip and elbow pointed away from the body. |
| alimentary canal |
the tube in the body through which food travels as it is digested. The alimentary canal goes from the mouth to the anus, and includes the esophagus, the stomach, and the small and large intestines. |
| allergic |
When you are allergic to something, like a plant or a food, it does something bad to your body when you eat it or touch it or have some other contact with it. |
| allergy |
a condition in which a person's body has an unusual reaction to certain things. An allergy can cause itching, coughing, sneezing, or trouble breathing. Allergies to animal hair, pollen, and certain foods are among the most common. |
| alligator |
a large reptile with short legs, a long body and tail, and a long, wide snout. Alligators are protected by thick skin with many hard bumps. They live in rivers, lakes, swamps, and other bodies of water in the southeast United States and in China. They usually eat insects, fish, turtles, snakes, birds, and other water animals, but have been known to attack small land mammals. They are closely related to crocodiles. Chinese alligators are endangered because their habitat is being changed by people. |
| anesthesia |
absence of pain or other feeling in the body. [1/2 definitions] |
| anesthetic |
a drug that causes numbness in the body or loss of consciousness. |
| anguish |
terrible pain or suffering of the mind or body. |
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