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anaconda a very large snake found in South America. Anacondas are not poisonous but kill other animals by squeezing them until they cannot breathe. Anacondas can grow to over twenty feet long.
animal one of a large group of living things that can move around by themselves to find food. Animals eat plants, funguses, or other animals. Birds, reptiles, fish, amphibians, mammals, insects, snails, and worms are some of the major kinds of animals. [1/2 definitions]
annual ring one of the rings of wood on the inside of a tree that can be seen when the tree is cut into logs. Each ring represents a year of growth.
anthology a collection of written works, such as poems or stories. An anthology can be written by one or by several authors.
anthrax an infectious, often fatal disease. Anthrax usually infects sheep or cattle, but can infect humans as well.
ape a mammal in the group of primates, which includes chimpanzees, gibbons, gorillas, and orangutans. Apes do not have tails. They have very flexible hands and feet. Apes range in size from three to six feet tall, and they can weigh up to 450 pounds. Apes live in the forests in Africa and Asia. [1/2 definitions]
arsenic a poisonous substance that is one of the chemical elements. It can be either grayish white, yellow, or black. (symbol: As)
aspect a way in which something can be seen or considered. [1/4 definitions]
asset (plural) property that can be exchanged for cash. [1/2 definitions]
assumption something that is supposed or believed without questioning. For example, if you ask someone whether she is allowed to watch TV during dinner, you have made an assumption that there is a TV in her house. Assumptions are ideas people have that are not based on proven facts. An assumption can be correct or incorrect. [1/2 definitions]
asteroid a small, rocky, planet-like body that circles the sun and is mostly found between the orbits of Jupiter and Mars. The size of an asteroid can vary from very tiny to six hundred miles across.
attachment something that can be attached to another thing. [1/3 definitions]
auricle the part of the ear that can be seen. [1/2 definitions]
baboon a large monkey that has a long snout like a dog's. Baboons live on the ground in large groups in Africa and Arabia. They can be powerful fighters.
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.
balloon a small bag made of rubber or other strong, light material that can be filled with air, or a gas lighter than air, and used as a decoration or toy. [1/3 definitions]
barbell a bar with weights attached at each end used for exercising and building muscle. Barbells are usually made of metal, and the weights can be changed to make the bar heavier or lighter.
barrel the amount that such a container can hold. [1/4 definitions]
bathtub a large tub in which a person can wash.
bead a small, round object made of material such as glass, wood, or plastic. A bead has a small hole through its center so it can be put on a string to make necklaces or to decorate clothing. [1/3 definitions]