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asylum a place for the care of those who are not able to care for themselves, such as children without parents, people with mental illness, or the very old. [1/3 definitions]
atom the smallest possible unit of a chemical element. The major parts of atoms contain protons, neutrons, and electrons. They are the basis of all matter in the universe. [1/2 definitions]
atomic bomb a very destructive bomb; atom bomb. Its power comes from the great amount of energy released when atoms are split.
auction a public sale at which things are sold to the people who offer the most money. [1/2 definitions]
auk a sea bird with webbed feet and short wings that lives in colder parts of the Northern Hemisphere. Auks are good at swimming and diving.
auxiliary verb a verb used with a main verb to complete the main verb's meaning. Some examples of auxiliary verbs are "have" in "I have escaped" and "should" in "You should go."
awl a tool used to make holes in leather or wood. Awls are small and have a sharp point.
babysit to take care of children while their parents are away.
babysitter a person who takes care of children when their parents are not with them.
backfire to have results that are the opposite of what one wanted. [1/3 definitions]
bacteria microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. Bacteria are each made up of only one cell, but different kinds of bacteria can take different shapes. These organisms live in all parts of the earth including oceans, deserts, glaciers, hot springs, and in the bodies of most living things. While some kinds of bacteria are dangerous, most kinds are useful because they help in the digestion of food, in the making of soil, in the creation of medicines, and in many other natural processes.
bacterium singular form of "bacteria." Bacteria are tiny living things made up of one cell each. Bacteria live in most living things and in all parts of the earth. Most bacteria are useful to people, but some are harmful because they can cause disease.
badger a furry mammal with short legs and a long body. The American badger has a white stripe on its forehead that runs down its back, and it has long dark marks on its face also. Badgers eat worms, rodents, rabbits, and plants. Different kinds of badgers live in Europe, Asia, and North America. They are related to skunks, otters, and other kinds of weasels. [1/2 definitions]
Bahamas a country made up of these islands. The Bahamas are also called the Commonwealth of the Bahamas. Nassau is the capital of the Bahamas. [1/2 definitions]
bake to cook using dry heat at a medium oven temperature. Things such as bread, cookies, and pies are baked. [1/3 definitions]
bakery a store in which baked goods, such as bread, cake, and pastry, are made or sold.
bake sale an event in which baked items, such as cookies and cupcakes, are sold in order to raise money for a particular cause.
balance a state in which opposite forces are equal. [1/6 definitions]
Balkan Peninsula a European peninsula between the Adriatic Sea on the west and the Black and Aegean Seas on the east. Some of the countries on the Balkan Peninsula are Greece, Macedonia, Albania, Croatia, Serbia, and Bulgaria.
ballot a piece of paper on which people who are voting enter their choices. [1/3 definitions]
bandit a robber who is often a member of a gang that robs people while they are travelling.