bearing firearms; having weapons: a heavily armed patrol.
maintained by arms: armed peace.
involving the use of weapons: armed conflict.
equipped: The students came armed with their pocket calculators.
(especially of an animal) covered protectively, as by a shell.
fortified; made secure: Armed by an inveterate optimism, he withstood despair.
(of an artillery shell, bomb, missile, etc.) having the fuze made operative.

1250–1300; Middle English; see arm2, -ed2

half-armed, adjective
well-armed, adjective Unabridged


2 [ahrm]
Usually, arms. weapons, especially firearms.
arms, Heraldry. the escutcheon, with its divisions, charges, and tinctures, and the other components forming an achievement that symbolizes and is reserved for a person, family, or corporate body; armorial bearings; coat of arms.
verb (used without object)
to enter into a state of hostility or of readiness for war.
verb (used with object)
to equip with weapons: to arm the troops.
to activate (a fuze) so that it will explode the charge at the time desired.
to cover protectively.
to provide with whatever will add strength, force, or security; support; fortify: He was armed with statistics and facts.
to equip or prepare for any specific purpose or effective use: to arm a security system; to arm oneself with persuasive arguments.
to prepare for action; make fit; ready.
bear arms,
to carry weapons.
to serve as a member of the military or of contending forces: His religious convictions kept him from bearing arms, but he served as an ambulance driver with the Red Cross.
take up arms, to prepare for war; go to war: to take up arms against the enemy.
under arms, ready for battle; trained and equipped: The number of men under arms is no longer the decisive factor in warfare.
up in arms, ready to take action; indignant; outraged: There is no need to get up in arms over such a trifle.

1200–50 for v.; 1300–50 for noun; (v.) Middle English armen < Anglo-French, Old French armer < Latin armāre to arm, verbal derivative of arma (plural) tools, weapons (not akin to arm1); (noun) Middle English armes (plural) ≪ Latin arma, as above

armless, adjective

8. outfit.

5. deactivate, disarm. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arm1 (ɑːm)
1.  (in man) either of the upper limbs from the shoulder to the wristRelated: brachial
2.  the part of either of the upper limbs from the elbow to the wrist; forearm
3.  a.  the corresponding limb of any other vertebrate
 b.  an armlike appendage of some invertebrates
4.  an object that covers or supports the human arm, esp the sleeve of a garment or the side of a chair, sofa, etc
5.  anything considered to resemble an arm in appearance, position, or function, esp something that branches out from a central support or larger mass: an arm of the sea; the arm of a record player
6.  an administrative subdivision of an organization: an arm of the government
7.  power; authority: the arm of the law
8.  any of the specialist combatant sections of a military force, such as cavalry, infantry, etc
9.  nautical See yardarm
10.  esp sport, ball games ability to throw or pitch: he has a good arm
11.  informal an arm and a leg a large amount of money
12.  arm in arm with arms linked
13.  at arm's length at a distance; away from familiarity with or subjection to another
14.  informal give one's right arm to be prepared to make any sacrifice
15.  in the arms of Morpheus sleeping
16.  with open arms with great warmth and hospitality: to welcome someone with open arms
17.  archaic (tr) to walk arm in arm with
Related: brachial
[Old English; related to German Arm, Old Norse armr arm, Latin armus shoulder, Greek harmos joint]

arm2 (ɑːm)
1.  to equip with weapons as a preparation for war
2.  to provide (a person or thing) with something that strengthens, protects, or increases efficiency: he armed himself against the cold
3.  a.  to activate (a fuse) so that it will explode at the required time
 b.  to prepare (an explosive device) for use by introducing a fuse or detonator
4.  nautical to pack arming into (a sounding lead)
5.  (usually plural) a weapon, esp a firearm
[C14: (n) back formation from arms, from Old French armes, from Latin arma; (vb) from Old French armer to equip with arms, from Latin armāre, from arma arms, equipment]

abbreviation for
adjustable rate mortgage

armed1 (ɑːmd)
1.  equipped with or supported by arms, armour, etc
2.  prepared for conflict or any difficulty
3.  (of an explosive device) prepared for use; having a fuse or detonator installed
4.  (of plants) having the protection of thorns, spines, etc

armed2 (ɑːmd)
a.  having an arm or arms
 b.  (in combination): long-armed; one-armed

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"body part," O.E. earm "arm," from P.Gmc. *armaz (cf. O.S., M.Du., Ger. arm, O.N. armr, O.Fris. erm), from PIE base *ar- "fit, join" (cf. Skt. irmah "arm," Armenian armukn "elbow," O.Prus. irmo "arm," Gk. arthron "a joint," L. armus "shoulder"). Arm of the sea was in O.E. Arm-twister "powerful persuader"
is from 1938. Arm-wrestling is from 1971.
"They wenten arme in arme yfere Into the gardyn" [Chaucer]

"weapon," c.1300, from O.Fr. armes (pl.), 11c., from L. arma "weapons," lit. "tools, implements (of war)," from PIE base *ar- "fit, join." The notion seems to be "that which is fitted together." Meaning "heraldic insignia" (in coat of arms, etc.) is early 14c.; originally they were borne on shields of
fully armed knights or barons. The verb meaning "to furnish with weapons" is from c.1200.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

arm 1 (ärm)
An upper limb of the human body, connecting the hand and wrist to the shoulder.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
  1. adjustable rate mortgage

  2. Alien Resistance Movement

  3. antiradiation missile

  4. Armenia (international vehicle ID)

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Bible Dictionary

Arm definition

used to denote power (Ps. 10:15; Ezek. 30:21; Jer. 48:25). It is also used of the omnipotence of God (Ex. 15:16; Ps. 89:13; 98:1; 77:15; Isa. 53:1; John 12:38; Acts 13:17)

Easton's 1897 Bible Dictionary
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Example sentences
Together, these factors could prepare the nucleus for an armed rebel group.
She requested that an armed university police officer be present in the room when she defended her dissertation.
Opponents said overturning the ban would be disruptive to the armed services.
Museums will soon be armed with a new tool to detect your fake paintings: a
  sharp-eyed computer program.
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