Definition of

Arm

  1. (noun, body) 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
  2. (noun, artifact) any projection that is thought to resemble a human arm
    an arm of the sea
    a branch of the sewer
  3. (noun, artifact) any instrument or instrumentality used in fighting or hunting
  4. (noun, artifact) the part of an armchair or sofa that supports the elbow and forearm of a seated person
  5. (noun, group) a division of some larger or more complex organization
    botany is a branch of biology
    the Germanic branch of Indo-European languages
  6. (noun, artifact) the part of a garment that is attached at the armhole and that provides a cloth covering for the arm
  7. (verb, competition) prepare oneself for a military confrontation
    troops are building up on the Iraqi border
  8. (verb, possession) supply with arms

via WordNet, Princeton University

Antonyms of Arm

disarm

Origin of the word Arm

  1. "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 "pow… more
  2. "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 "… more

via Online Etymology Dictionary, ©2001 Douglas Harper

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