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Comprehensive
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aardvark a large mammal with a long snout, long ears, a long tail, and with long fur mostly around its legs. Aardvarks are active at night, when they use their powerful claws to dig open ant or termite nests. They catch their food with their long, sticky tongue. Aardvarks live in southern and central Africa. Although they are sometimes called anteaters, aardvarks are not closely related to any other kind of mammal.
abbey a religious place or building where monks or nuns live.
abide to live; dwell. [1/3 definitions]
Abominable Snowman a large manlike animal covered with hair, said to live in the Himalayas; yeti.
aborigine one of the first people to live in an area.
aerobe an organism, such as a bacterium, that needs oxygen to live.
ai2 a large three-toed sloth of Central and South America, whose coat has a greenish tinge from the algae that live in it.
air the mixture of gases that is in the space around the earth. People need air to live.
algae organisms that live mainly in the water and make their food through photosynthesis. Algae are different from plants in that they have no true leaves, roots, or stems. Seaweeds are algae. "Algae" is a plural noun; the singular form is "alga."
alligator a large reptile with short legs, a long body and tail, and a long, wide snout. Alligators are protected by thick skin with many hard bumps. They live in rivers, lakes, swamps, and other bodies of water in the southeast United States and in China. They usually eat insects, fish, turtles, snakes, birds, and other water animals, but have been known to attack small land mammals. They are closely related to crocodiles. Chinese alligators are endangered because their habitat is being changed by people.
alpaca an animal with long legs and a long neck. Alpacas live in the mountains of South America. They are mammals closely related to llamas and to camels. Alpacas are raised for their long, soft wool.
Amish a Christian sect that separated from the Mennonites in the seventeenth century, the members of which advocate simple living and now live mostly in farming areas of the northeastern United States. [1/3 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.
amphibious able to live both on land and in water. [1/2 definitions]
anaerobic able to live or act in the absence of free oxygen. [1/2 definitions]
a new lease on life an opportunity to live a happier life because of improved circumstances.
ant a small insect, often red or black. Ants live in large groups in the ground.
anteater a mammal that uses its long, sticky tongue to eat ants and termites. True anteaters have no teeth, are furry, and live in Central or South America. They are related to armadillos and sloths. Other kinds of mammals that eat ants are also sometimes called anteaters, but they are not related to American anteaters.
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]
apartment one or more rooms that people live in and that are part of a building.
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]