| arm | (noun) the part of a garment that is attached at the armhole and that provides a cloth covering for the arm | Synonyms: sleeve |
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| (noun) any instrument or instrumentality used in fighting or hunting | Synonyms: weapon, weapon system |
| (noun) the part of an armchair or sofa that supports the elbow and forearm of a seated person | - |
| (noun) any projection that is thought to resemble a human arm | Synonyms: branch, limb |
| (noun) a human limb; technically the part of the superior limb between the shoulder and the elbow but commonly used to refer to the whole superior limb | - |
| (noun) a division of some larger or more complex organization | Synonyms: branch, subdivision |
| (verb) prepare oneself for a military confrontation | Synonyms: build up, fortify, gird |
| (verb) supply with arms | - |
| armada | (noun) a large fleet | - |
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| armadillo | (noun) burrowing chiefly nocturnal mammal with body covered with strong horny plates | - |
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| armament | (noun) the act of equipping with weapons in preparation for war | Synonyms: arming, equipping |
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| (noun) weaponry used by military or naval force | - |
| armamentarium | (noun) the collection of equipment and methods used in the practice of medicine | - |
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| armature | (noun) coil in which voltage is induced by motion through a magnetic field | - |
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| armband | (noun) a band worn around the upper arm | - |
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| (noun) worn around arm as identification or to indicate mourning | - |
| armchair | (noun) chair with a support on each side for arms | - |
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| armed | (adjective) (used of persons or the military) characterized by having or bearing arms | - |
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| (adjective) (used of plants and animals) furnished with bristles and thorns | - |
| (adjective) having arms or arms as specified; used especially in combination | - |
| armet | (noun) a medieval helmet with a visor and a neck guard | - |
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| armful | (noun) the quantity that can be contained in the arms | - |
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| armguard | (noun) a protective covering for the wrist or arm that is used in archery and fencing and other sports | Synonyms: bracer |
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| armhole | (noun) a hole through which you put your arm and where a sleeve can be attached | - |
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| armiger | (noun) a squire carrying the armor of a knight | Synonyms: armor-bearer |
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| (noun) a nobleman entitled to bear heraldic arms | - |
| armilla | (noun) (archeology) a bracelet worn around the wrist or arm | - |
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| (noun) a celestial globe consisting of metal hoops; used by early astronomers to determine the positions of stars | Synonyms: armillary sphere |
| armillary | (adjective) of or relating to bracelets | - |
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| arming | (noun) the act of equipping with weapons in preparation for war | Synonyms: armament, equipping |
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| armistice | (noun) a state of peace agreed to between opponents so they can discuss peace terms | Synonyms: cease-fire, truce |
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| armless | (adjective) having no arms | - |
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| armlet | (noun) a band worn around the arm for decoration | Synonyms: arm band |
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| armlike | (adjective) resembling an arm | - |
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| armoire | (noun) a large wardrobe or cabinet; originally used for storing weapons | - |
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| armor | (noun) tough more-or-less rigid protective covering of an animal or plant | Synonyms: armour |
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| (noun) protective covering made of metal and used in combat | Synonyms: armour |
| (noun) a military unit consisting of armored fighting vehicles | Synonyms: armour |
| (verb) equip with armor | Synonyms: armour |
| armored | (adjective) protected by armor (used of persons or things military) | Synonyms: armoured |
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| (adjective) used of animals; provided with protective covering | Synonyms: armoured |
| (adjective) equipped with the complete arms and armor of a warrior | Synonyms: panoplied |
| armorer | (noun) a manufacturer of firearms | Synonyms: armourer |
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| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armourer, artificer |
| (noun) a worker skilled in making armor or arms | Synonyms: armourer |
| armorial | (adjective) of or relating to heraldry or heraldic arms | - |
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| armory | (noun) a place where arms are manufactured | Synonyms: armoury, arsenal |
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| (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armoury, arsenal |
| (noun) all the weapons and equipment that a country has | Synonyms: armoury, arsenal |
| (noun) a collection of resources | Synonyms: armoury, inventory |
| armour | (noun) tough more-or-less rigid protective covering of an animal or plant | Synonyms: armor |
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| (noun) protective covering made of metal and used in combat | Synonyms: armor |
| (noun) a military unit consisting of armored fighting vehicles | Synonyms: armor |
| (verb) equip with armor | Synonyms: armor |
| armoured | (adjective) protected by armor (used of persons or things military) | Synonyms: armored |
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| (adjective) used of animals; provided with protective covering | Synonyms: armored |
| armourer | (noun) a manufacturer of firearms | Synonyms: armorer |
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| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armorer, artificer |
| (noun) a worker skilled in making armor or arms | Synonyms: armorer |
| armoury | (noun) a place where arms are manufactured | Synonyms: armory, arsenal |
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| (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armory, arsenal |
| (noun) all the weapons and equipment that a country has | Synonyms: armory, arsenal |
| (noun) a collection of resources | Synonyms: armory, inventory |
| armpit | (noun) the hollow under the arm where it is joined to the shoulder | Synonyms: axilla, axillary cavity, axillary fossa |
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| armrest | (noun) a support for the arm | - |
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| arms | (noun) weapons considered collectively | Synonyms: implements of war, munition, weaponry, weapons system |
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| (noun) the official symbols of a family, state, etc. | Synonyms: blazon, blazonry, coat of arms |
| army | (noun) a permanent organization of the military land forces of a nation or state | Synonyms: ground forces, regular army |
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| (noun) a large number of people united for some specific purpose | - |
| armyworm | (noun) moth whose destructive larvae travel in multitudes | Synonyms: Pseudaletia unipuncta |
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| (noun) noctuid moth larvae that travel in multitudes destroying especially grass and grain | Synonyms: army worm, Pseudaletia unipuncta |
| (noun) larva of fungus gnat that feed on cereals and other grains; they march in large companies in regular order when the food is exhausted | - |