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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.
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.
antonym a word that has the opposite meaning of another word.
anvil a heavy metal block with a flat top on which heated metal objects are hammered into shapes.
anxiety a feeling of being worried, nervous, or afraid that something will happen.
anxious feeling worried, nervous, or afraid about something uncertain. [2 definitions]
any one or some, no matter which or how many. [5 definitions]
anybody any person; anyone.
anyhow in any way at all. [2 definitions]
anymore any longer.
anyone any person; anybody.
anyplace in or to any place; anywhere.