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bike (informal) a short form of bicycle or motorcycle. [2 definitions]
bile a bitter, yellowish liquid made in the liver. Bile helps to digest fats. [2 definitions]
bilingual able to speak two languages well. [2 definitions]
bill1 a written list showing the cost of items bought or services provided. [4 definitions]
bill2 the parts of a bird's jaw that form the beak.
billboard a large board for displaying outdoor advertisements, often seen next to highways.
billfold a small folding case that holds paper money and fits in a pocket; wallet.
billiards a game played with long sticks and hard balls on a special table covered with cloth. Players use a stick to hit the balls against each other and into pockets along the edges of the table.
billion the number that is equal to one thousand times one million; 1,000,000,000. [4 definitions]
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.