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air	Air is what you breathe. People need air and food and water to live. Air is all around us, but we can't see it or smell it or taste it. Sometimes we say the air smells good or smells bad, but that is because something else is in the air. [1/2 definitions]
alligator	An alligator is a large, powerful reptile that lives in and around water. An alligator has a long body and tail, but it has short legs. It also has a long snout and many sharp teeth.
amphibian	An amphibian is a type of animal. Amphibians live in the water for one part of their lives and on land for the other. Frogs and toads are some animals that are amphibians.
aquarium	An aquarium is a container filled with water that people use as a home for fish and other water animals. An aquarium is usually made of clear glass. It can be very small so that you can keep it in your room or very big so that even sharks can live in it. [2 definitions]
Arabian Sea	The Arabian Sea is a large body of water that lies between India and the countries of Oman and Yemen. The Arabian Sea is part of the Indian Ocean.
Arctic Ocean	The Arctic Ocean is one of the five oceans of the world. An ocean is a large body of salt water that covers a very large part of the earth. The Arctic Ocean is in the most northern part of the world and it is very cold and icy. If you look at a map, it is above Canada, Russia, and other far northern countries of the world.
Atlantic Ocean	The Atlantic Ocean is one of the five oceans on our planet. An ocean is a large body of salt water that covers a very large part of the earth. It is much bigger than a sea or lake. If you want to travel from America to Africa or Europe, the fastest way is to cross the Atlantic Ocean.
Baltic Sea	The Baltic Sea is a large body of water in northern Europe. It lies between the countries of Sweden and Finland, and it touches other countries such as Denmark, Estonia, Latvia, and Lithuania. Fishing boats go out into the Baltic Sea, and people often cross the sea in ferries as they travel from country to country.
barnacle	A barnacle is a small sea animal that lives in water close to the shore. Like crabs and lobsters, barnacles grow a shell around their bodies. When a barnacle is an adult, it attaches its shell to rocks, the bottom of boats, or other hard surfaces.
bath	When you take a bath, you sit in a tub of water and wash yourself.
bathtub	A bathtub is something that you sit in to wash your whole body. You fill it with water and then you get into it to wash yourself.
batter²	Batter is a thick mixture of flour and milk or water and usually eggs. Batter is used to make cake, pancakes, and other things.
bay¹	A bay is a part of a sea or part of a large lake. A bay is the water inside a curving area of land.
Bay of Bengal	The Bay of Bengal is a large body of water that is part of the Indian Ocean. It is the part that touches India, Bangladesh, and Myanmar.
beaver¹	A beaver is an animal that lives in and out of the water in rivers and lakes. It has long, sharp front teeth that can cut wood, and it has thick brown fur and a wide flat tail. Beavers are famous for working hard to make their homes out of tree branches.
beverage	A beverage is any kind of liquid that people drink that is not water or medicine. Juice, milk, soda, tea, and coffee are beverages.
Black Sea	The Black Sea is a large body of water located between the country of Ukraine to the north and the country of Turkey to the south. The Black Sea is not really black, but sometimes the water can look very dark. On a map, the Black Sea looks like a big lake, but the water is salty, and it connects to another sea, which connects to the Atlantic Ocean.
boat	A boat is something you use to travel on water. It is usually smaller than what we call a ship.
body	A body of water is a particular area of water on the earth. Lakes, oceans, and rivers are all bodies of water. A body of land is an area of land, like an island or a continent. Bodies of water and land often have names. [1/3 definitions]
boil¹	When you boil water or other liquid, you make it hotter and hotter until there are bubbles in it.
bottle	A bottle is something people use to hold things like water, milk, or juice. A bottle is more narrow at the top than at the bottom, and it's usually made of glass or plastic.

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