arm n
1. 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. any instrument or instrumentality used in fighting or hunting; "he was licensed to carry a weapon" [syn: weapon, weapon system]
3. an administrative division of some larger or more complex organization; "a branch of Congress" [syn: branch, subdivision]
4. any projection that is thought to resemble an arm; "the arm of the record player"; "an arm of the sea"; "a branch of the sewer" [syn: branch, limb]
5. the part of an armchair or sofa that supports the elbow and forearm of a seated person
6. the part of a garment that is attached at armhole and provides a cloth covering for the arm [syn: sleeve] v
7. prepare oneself for a military confrontation; "The U.S. is girding for a conflict in the Middle East"; "troops are building up on the Iraqui border" [syn: build up, fortify, gird] [ant: disarm]
8. supply with arms; "The U.S. armed the freedom fighters in Afghanistan"

Arm \Arm\, n. [AS. arm, earm; akin to OHG. aram, G., D., Dan., & Sw. arm, Icel. armr, Goth. arms, L. armus arm, shoulder, and prob. to Gr. ? joining, joint, shoulder, fr. the root ? to join, to fit together; cf. Slav. rame. ?. See Art, Article.]
1. The limb of the human body which extends from the shoulder to the hand; also, the corresponding limb of a monkey.
2. Anything resembling an arm; as, (a) The fore limb of an animal, as of a bear. (b) A limb, or locomotive or prehensile organ, of an invertebrate animal. (c) A branch of a tree. (d) A slender part of an instrument or machine, projecting from a trunk, axis, or fulcrum; as, the arm of a steelyard. (e) (Naut) The end of a yard; also, the part of an anchor which ends in the fluke. (f) An inlet of water from the sea. (g) A support for the elbow, at the side of a chair, the end of a sofa, etc.
3. Fig.: Power; might; strength; support; as, the secular arm; the arm of the law.

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In anatomy, an arm is one of the upper limbs (also called forelimbs) of an animal. The term arm can also be used for analogous structures, such as one of the paired upper limbs of a four-legged animal, or the arms of cephalopods.

In anatomical usage, the term arm refers specifically to the segment between the shoulder and the elbow, while the segment between the elbow and wrist is the forearm. However, in common, literary, and historical usage, arm refers to the entire upper limb from shoulder to wrist.

In primates the arms are richly adapted for both climbing and for more skilled, manipulative tasks. The ball and socket shoulder joint allows for movement of the arms in a wide circular plane, while the presence of two forearm bones which can rotate around each other allows for additional range of motion at this level.

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