| biodegradable |
able to be broken down by the action of living organisms such as bacteria. |
| biodiverse |
of an area or region, having many different kinds of plants and animals. |
| biodiversity |
the condition of having a wide variety of living things. If an area on the earth has biodiversity, it means that there are many different kinds of animals and plants living there. |
| 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. |
| bionic |
an electronic or mechanical device that replaces or helps something natural. An artificial leg is one kind of bionic device. |
| 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. |
| 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, round-shaped bread for one person made with baking powder or baking soda instead of yeast. Biscuits are not usually sweet. [3 definitions] |
| bisect |
to cut or split into two equal parts. [2 definitions] |