| bionic |
an electronic or mechanical device that replaces or helps something natural. An artificial leg is one kind of bionic device. |
| biosphere |
the parts of the earth and its atmosphere that can support the existence of living things. The biosphere includes areas of water and air, and of land both above and below the ground. [2 definitions] |
| biplane |
an early type of airplane with two sets of wings mounted one above the other. |
| 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. |
| bird feeder |
an outdoor device used for feeding wild birds. A bird feeder is typically filled with seeds and grain and hung from a tree branch or post. |
| birdhouse |
something constructed by humans as a place for a bird to build its nest. A birdhouse often looks like a small, simple house. |
| birds of a feather |
a group of people who have similar interests, values, opinions, or backgrounds. (from the expression "Birds of a feather flock together.") |
| birth |
the act or fact of being born. [3 definitions] |
| birthday |
the calendar day and month of one's birth, usually celebrated each year as that date occurs. |
| birthmark |
a mark or mole on the skin present from birth. |
| birthplace |
the place of birth or origin of a person, idea, or movement. |
| birthright |
a right, privilege, or property to which one is entitled by birth. |
| biscuit |
a small, bread roll for one person made with baking powder or baking soda instead of yeast. Biscuits contain quite a lot of butter or other shortening and are not usually sweet. [3 definitions] |
| bisect |
to cut or split into two equal parts. [2 definitions] |
| bishop |
a priest or minister who holds a high position in certain Christian churches. A bishop is often in charge of a group of churches. In the Catholic Church, a bishop's rank is above a priest but below an archbishop and a cardinal. [2 definitions] |
| bison |
a very large mammal with a large head, humped shoulders, and short curved horns. Bison used to roam the plains of North America in large herds, but they were hunted until they were almost extinct. North American bison are also called buffalo, but they are not related to the true buffalo of Africa and Asia. Bison have hooves and are closely related to cattle. Bison eat only plants and chew their cud. [2 definitions] |
| bit1 |
the metal part of a bridle that is placed in the mouth of a horse and used to control it. [2 definitions] |
| bit2 |
a small amount; little piece. [2 definitions] |
| bit3 |
the smallest unit of information in a computer. |
| bit4 |
past tense and a past participle of "bite." |