| bin |
a container or space for storing things such as wood, certain foods, or coal. Bins are also used for storing things that will be discarded later. |
| binary |
having two parts or components. [2 definitions] |
| binary system |
a numbering system with a base of two. In binary numbers, any number can be expressed by 1, 0, or a combination of these. The number five is written as "101" in the binary system. |
| bind |
to tie together or fasten tightly with a rope or cord. [4 definitions] |
| binder |
a large, sturdy notebook cover that contains a device for holding loose papers. |
| bingo |
a game in which players try to match numbers on a card with numbers read out by a caller. Each player has a card with numbered squares. The player who is the first to cover a whole row of squares is the winner. |
| binocular |
(usually plural) a device that uses lenses and mirrors to make objects look larger. Binoculars are used with both eyes at once. |
| biodegradable |
able to be broken down by the action of living organisms such as bacteria. |
| biography |
the written story of the facts and events of a person's life. |
| biological |
of or having to do with biology. [2 definitions] |
| 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. |