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antecedent the word or group of words that a pronoun refers to. In "The girls ate their dessert first," "girls" is the antecedent of "their."
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. [2 definitions]
antenna a metal device that sends or receives radio or television signals. [2 definitions]
anthem a song of praise or patriotism. [2 definitions]
anther the part of a flower's stamen that bears pollen.
anthill a pile of earth made by ants as they dig their underground nest. Anthills are found near the nest entrance.
anthology a collection of written works, such as poems or stories. An anthology can be written by one or by several authors.
anthracite a hard, shiny coal that burns with little flame or smoke.
anthrax an infectious, often fatal disease. Anthrax usually infects sheep or cattle, but can infect humans as well.
anthropology the scientific study of humankind. People who study anthropology learn about the origins and development of human beings and their societies and customs.
anti- a prefix that means "against" or "opposed to." [2 definitions]
antibiotic substance derived from fungi or other organisms and used to destroy or prevent the growth of bacteria or other disease-causing organisms.
antibody a protein in blood that reacts to particular toxic substances by neutralizing or destroying them. Antibodies provide immunity against these toxic substances.
anticipate to look forward to; expect. [2 definitions]
anticipation the act or process of anticipating. [2 definitions]
antidote a substance that stops poison from working or cures a disease.
antifreeze a substance that lowers the freezing point of a liquid such as water.
Antigua and Barbuda a country in the Caribbean Sea made up of three islands. The capital of Antigua and Barbuda is St. John's.
antique from or made in a time long ago. [2 definitions]
antiseptic a substance or drug that kills germs that cause disease or decay.
antitoxin an antibody formed in the body to act against a specific poison.