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billow a large wave in the ocean; swell. [2 definitions]
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.
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.