| 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. |
| air |
the mixture of gases that surrounds the earth. Air is made up of oxygen, nitrogen, and other gases, and has no taste, odor, or color. [1/6 definitions] |
| blood |
the red liquid containing oxygen and nutrients that pumps through the veins and arteries of humans and many other animals. [1/2 definitions] |
| carbohydrate |
a compound made of carbon, hydrogen, and oxygen. It is formed mainly by plants, and it is used in the body to easily produce and store energy. Sugars and starches are carbohydrates. [2 definitions] |
| carbon dioxide |
a gas without color or odor that is made up of carbon and oxygen. Carbon dioxide is in the air and is used in soft drinks. Frozen carbon dioxide is called dry ice. |
| charcoal |
the solid, black form of carbon made by burning wood or other matter in a space with very little oxygen. [1/2 definitions] |
| dioxide |
a compound containing two atoms of oxygen bound to a single atom of another element. |
| draft |
a device that controls the flow of air in a stove or furnace. Fires need the oxygen in air in order to burn. [1/10 definitions] |
| element |
any of the 118 substances that cannot be separated into simpler substances by using chemistry. Lead, gold, and oxygen are examples of elements. [1/4 definitions] |
| fat |
a white or yellow oily substance found in some parts of animals or plants. Fat is made of carbon, hydrogen, and oxygen. [1/4 definitions] |
| hydrogen |
a very light gas that burns easily and is one of the chemical elements. Hydrogen is the most abundant element in the universe. It combines with oxygen to make water, and it is found in all living things. Hydrogen combines with many substances and has many uses. (symbol: H) |
| incubator |
a warm container that protects and helps babies that are sick or born too early. An incubator allows doctors to control the temperature, amount of oxygen, and other conditions that affect a baby's health. [1/2 definitions] |
| lung |
one of two organs in the chest that are used in breathing. Lungs are found in mammals, birds, reptiles, and some other animals. They bring oxygen to the body and get rid of carbon dioxide. |
| mask |
a covering for the mouth and nose to protect the wearer from germs, poisonous gases, dust, or the like. A mask is also used to protect other people from one's own germs. Some kinds of masks are used to provide oxygen or other breathable gas to the wearer through an attached tube. [1/6 definitions] |
| O2 |
symbol of the chemical element oxygen. |
| oxide |
a compound that includes oxygen. |
| oxidize |
to combine with oxygen. [1/2 definitions] |
| oxygen |
a gas with no color or smell that is one of the chemical elements. Oxygen combines with hydrogen to make water. It also makes up about twenty percent of the earth's atmosphere. Most living things need oxygen. (symbol: O) |
| ozone |
a form of oxygen that occurs when oxygen is exposed to an electrical charge, like lightning. It is found naturally in Earth's atmosphere. |
| protein |
a substance that is made up of nitrogen, carbon, oxygen, hydrogen, and possibly other elements. Proteins are found in all living things and are a necessary part of life processes. |