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allergy	a condition in which a person's body has an unusual reaction to certain things. An allergy can cause itching, coughing, sneezing, or trouble breathing. Allergies to animal hair, pollen, and certain foods are among the most common.
almighty	having complete power or the most power. [1/2 definitions]
amoeba	a tiny living thing made of only one cell. Amoebas move by changing their shape. They eat by wrapping their bodies around their food. Amoebas live in fresh and salt water, soil, and in animals. Most kinds of amoebas can only be seen through a microscope.
among	with all or most of. [1/5 definitions]
Amsterdam	the official capital city of the Netherlands. Most of the government of the Netherlands is located in another city, The Hague.
ant	an insect that lives in large, organized groups called colonies. Most kinds of ants live in or on the ground. Ants are related to bees and wasps.
antelope	an animal with horns, a long neck, long legs, and hooves. Antelopes are known for their fast running. Antelopes are mammals that eat plants and chew their cud. The smallest kind of antelope is only one foot tall; the largest antelope is six feet tall at the shoulder. Gazelles, gnus, and impalas are all antelopes. Most antelopes live in Africa; some also live in Asia. [1/2 definitions]
antler	one of a pair of bony growths on the head of most kinds of deer. Male elk, moose, and white-tailed deer all grow antlers with branches or prongs. Deer grow new antlers every year. Caribou and reindeer are the only deer that have antlers on both the males and the females.
appliance	a device used for a particular purpose. Stoves, refrigerators, toasters, vacuum cleaners, and room heaters are some appliances used in the home. Most applicances use electricity.
Arab	a member of a southwest Asian people that makes up most of the population of Arabia and other parts of the Middle East. [1/4 definitions]
arch-	a prefix that means "main" or "most important."
auction	a public sale at which things are sold to the people who offer the most money. [1/2 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.
bat²	a small mammal that flies. Bats have small bodies and large wings covered with skin. Most bats eat at night, when they use sound to find and catch flying insects. Bats are found in most parts of the world. There are around one thousand kinds of bats. Their wingspans range from less than two inches to more than five feet. Some kinds of bats live in large colonies that roost in caves or in a section of forest.
beat around the bush	to avoid or delay speaking about the most important matter.
Berlin	the capital city of Germany. Between 1945 and 1990 the city was divided into East Berlin and West Berlin. For most of that time the Berlin Wall, a concrete and wire barrier, separated East and West Berlin.
best	with the most success or effect. [1/6 definitions]
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.
black bear	a medium-sized bear, usually with thick black or reddish brown fur. They are the most common bears in North America and live in forests and mountain areas. [1/2 definitions]
bottom	the cause or most important part. [1/6 definitions]

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