| air |
Air is one of the things we need to live. Air is what we breathe. It is a mixture of gases. Although we breathe air, we cannot smell it, taste it, or see it. Sometimes we smell something that is in the air, but air itself does not have any smell. [1/4 definitions] |
| allergy |
When you have an allergy to something like a plant or food, something bad happens to your body when you touch it or eat it or have some other contact with it. An allergy can make you sneeze, itch, cough, or make it hard for you to breathe. |
| amphibian |
a small animal that spends part of its life cycle in water and part of its life cycle on land. Amphibians hatch in water and breathe with gills. Then they develop lungs so the adults can breathe air. Amphibians are cold-blooded animals with skeletons inside their bodies. Frogs, toads, and salamanders are amphibians. [1/2 definitions] |
| anaconda |
a very large snake found in South America. Anacondas are not venomous but kill other animals by squeezing them until they cannot breathe. Anacondas can grow to over twenty feet long. |
| apparatus |
An apparatus is a piece of equipment, machine, or group of machines designed to let people do some specific thing. If you want to swim deep underwater, for example, you would probably wear an apparatus designed to let you breathe. |
| asthma |
a disease of the lungs that makes it difficult to breathe. Asthma is often caused by an allergy. |
| atmosphere |
The planet Earth is surrounded by gases. These gases all together are called Earth's atmosphere. As our planet travels through space and around the sun, its atmosphere stays with it. Other planets can have an atmosphere too, but Earth's atmosphere has just the right mixture of gases for humans to live. Our atmosphere lets us breathe and also protects us from the strong energy of the sun. [1/2 definitions] |
| blowhole |
a nostril in the top of the head of a whale, dolphin, or porpoise. The blowhole is used to breathe. [2/3 definitions] |
| boa constrictor |
a large snake that lives in the tropical areas of Central and South America. Boa constrictors are pale brown with darker marks and are not venomous. They kill their prey by winding around it and squeezing it until it cannot breathe. |
| breathe |
When you breathe, you bring air into your body through your nose or mouth and then you let air go back out. |
| carbon dioxide |
Carbon dioxide is a gas that is made up of the chemical elements oxygen and carbon. This gas has no color or smell. Carbon dioxide is produced in many different ways. People put a little carbon dioxide into the air every time they breathe out. Carbon dioxide is also made by the burning of fuels, and it is created when plants die and decay. Carbon dioxide is often written CO2 and pronounced "see oh two." |
| choke |
When something chokes you, it makes it hard for you to breathe by squeezing your throat. [1/2 definitions] |
| constrictor |
a snake that kills its prey by winding around it and squeezing it until it can not breathe. Pythons, boa constrictors, and anacondas are constrictors. |
| cough |
When you cough, you push air out from your lungs and make a sharp noise in your throat. People often cough when they have a cold or when they breathe in something that feels bad to the lungs. [1/4 definitions] |
| could |
We use could to talk about what would be possible in a situation that is not real. For example, you are not a fish, so you can't breathe in the water, but if you were a fish, you could breathe in the water! [1/3 definitions] |
| dolphin |
a mammal that lives in the water. Dolphins look like large fish but they breathe air. They have teeth and a snout that looks like a beak. Most kinds of dolphins live in the ocean. A few kinds live in large rivers in Asia and South America. Dolphins are closely related to porpoises and other toothed whales. |
| dragon |
an imaginary monster that looks like a giant lizard with wings, claws, and a long tail. In stories or pictures, dragons breathe fire and often guard a place or treasure. |
| draw |
to breathe in; inhale. [1/8 definitions] |
| exhale |
to breathe out; give out breath or vapor. |
| fish |
A fish is an animal that lives in water and does not breathe air. Fish have bones inside their bodies and scales on their skin. [1/4 definitions] |
| gargle |
to tip the head back and breathe out through a liquid held at the back of the throat. [1/2 definitions] |