| biography |
the written story of the facts and events of a person's life. |
| biological |
of or having to do with biology. [2 definitions] |
| biologist |
a scientist who specializes in biology. Biology is the study of living things, such as plants, animals, cells, and bacteria. |
| biology |
the science that studies the growth and life processes of living things. |
| bioluminescence |
light given off naturally by certain kinds of insects, fish, or bacteria. The bioluminescence of fireflies allows them to blink on and off in the dark. |
| biomass |
the total amount of living things in a particular environment, measured by mass per unit of area or volume. |
| biome |
a major type of global region, such as forest, desert, or grassland, characterized by the community of plants and animals that have adapted to life under the particular soil and climatic conditions that a particular region presents. |
| 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] |