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ark of the covenant according to the Old Testament, the sacred chest in which the ancient Hebrews carried the two stone tablets inscribed with the Ten Commandments.
arm1 either of the two upper limbs of the human body, between the shoulders and the wrists. [3 definitions]
arm2 (usu. pl.) weapons, esp. those that shoot or explode. [7 definitions]
armada a fleet of armed ships. [2 definitions]
armadillo a burrowing nocturnal mammal of the southern United States and South America, whose body is armored by jointed, bony plates.
Armageddon according to the New Testament, the place where the final, decisive conflict between good and evil will be fought. [2 definitions]
armament weapons and supplies used to equip a military unit such as a tank, warship, airplane, or the like. [4 definitions]
armature a coil-wrapped iron core that rotates in a magnetic field to induce electrical current in a generator, or that produces motion in an electrical motor when current is passed through it. [4 definitions]
armband a cloth band worn around the upper arm as a badge of rank, membership, or the like, or as a symbol, as of mourning.
armchair a chair having supports at the sides for resting one's arms. [2 definitions]
armed holding or bearing weapons. [4 definitions]
armed forces all the military forces of a nation or group of nations.
Armenia a Near Eastern country between Georgia and Turkey; formerly a republic of the Soviet Union. [2 definitions]
Armenian of or pertaining to Armenia or its people, culture, language, or the like. [3 definitions]
armful the quantity that can be carried by one arm or in the arms.
armhole an opening in a garment meant for the arm to pass through, as into a sleeve.
armillary of or made up of circles, rings, or hoops.
armillary sphere an ancient sighting instrument formed of rings that are arranged in the positions of the tropics, equator, and the like.
armistice an agreement by warring parties to suspend hostilities; truce.
Armistice Day November 11, the anniversary of the armistice ending World War I, called Veterans Day in the United States.
armlet a band worn as an ornament, usu. on the upper arm. [2 definitions]