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armadillo	a mammal whose body is protected by hard, bony plates. Armadillos live in Central and South America, and the southern United States. Some kinds of armadillos are only six inches long; other kinds grow up to four feet in length. They eat mostly insects and are related to sloths and anteaters.
arthropod	a large group of animals with hard shells on the outsides of their bodies, legs with joints, and no bones inside their bodies. Insects, spiders, centipedes, and crabs are arthropods.
asphalt	Asphalt is a black, sticky substance. It can be found in nature, but it is often created by people from oil and coal tar. Hot asphalt is often mixed with small rocks or sand and used to make roads and other things. This mixture is also called asphalt. When asphalt cools, it becomes hard.
bake	to make hard with heat. [1/3 definitions]
bamboo	a tropical grass plant that has hard, woody, hollow stalks. Bamboo stalks grow straight and tall, and very quickly. Many kinds of bamboo grow as high as a tree. [1/2 definitions]
band²	a thin strip of hard material, often metal, in the shape of a ring. [1/4 definitions]
bang	a sudden, loud, explosive sound. [5 definitions]
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.
batter¹	to beat hard again and again, or to damage by beating. [1/2 definitions]
beak	the hard, curved mouth parts of a bird; bill.
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 wood.
beetle¹	an insect with a pair of hard front wings that covers a pair of thin wings. There are many different kinds of beetles. Japanese beetles, ladybugs, and fireflies are beetles.
bend over backward	to try very hard; make a great effort.
bend over backwards	to try very hard; make a great effort.
beryllium	a hard, light, gray substance that is one of the chemical elements. Beryllium is sometimes combined with other elements to form an alloy. It is also used in building rockets. (symbol: Be)
bill²	the hard outer part of a bird's mouth that sticks out from its face. A bill is made up of a lower part and an upper part; beak.
billiards	a game played with long sticks and hard balls on a special table covered with cloth. Players use a stick to hit the balls against each other and into pockets along the edges of the table.
binder	A binder is something that is used to hold loose papers together. It has two hard covers that are held together like a book. Inside the covers, there is a device that holds the papers inside the binder. Some binders also have pockets on the inside of the covers.
birch	a tree or shrub with hard wood and smooth bark that can be peeled off.
bird	an animal with two wings, two feet, and a body covered with feathers. Most birds can fly. Birds are warm-blooded animals with skeletons inside their bodies. Birds lay eggs with hard shells. Robins, eagles, chickens, and ostriches are a few of the many kinds of birds.
bitter	When the weather is bitter, it means that the weather is very cold, and it's hard to be outside in it. [1/3 definitions]

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