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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.
anything any thing, happening, or subject whatever. [3 definitions]
anytime at any moment, hour, or day; whenever.
anyway in any case; anyhow; no matter what happens.
anywhere to or in any place or direction; at any place.
aorta the main artery of the body. The aorta carries blood from the left side of the heart to all parts of the body except the lungs.
Apache a member of a North American Indian people living mostly in the southwestern United States and northern Mexico.
apart away from each other in time or space; at or to a distance; separated. [2 definitions]
apartheid a policy of keeping people of different races separate and unequal in a society.
apartment a room or set of rooms used as living space.