Definition of limb | Bee Dictionary of English

n one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper
n any of the main branches arising from the trunk or a bough of a tree
n (astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet
n either of the two halves of a bow from handle to tip
the upper limb of the bow
n the graduated arc that is attached to an instrument for measuring angles
the limb of the sextant
n any projection that is thought to resemble a human arm

When a patient bends the unaffected arm, sensors detect the activity and send signals to rubber muscles wrapped around the other limb, which then mimics the healthy arm's motions.
She swims without the aid of a prosthetic limb and is unlikely to win a medal.
Besides, as Sethi explains, the old artificial limb was a cultural misfit not just for Indians but for people in most developing countries.

Tree limb causes power outage in eastern Tippecanoe County
A tree limb across power lines near Indiana 26 caused an outage Monday morning for about 260 Duke Energy customers in eastern Tippecanoe County, a Duke spokesman said.
June 11, 2013 - Journal & Courier
Children spend week at Disney for softball camp
Twenty children who suffered limb loss are joining the Wounded Warrior Amputee Softball Team for a fun week-long camp at Disney World's ESPN Wide World of Sports.
June 11, 2013 - WESH 2 Orlando
S&P Revises U.S. Outlook To Stable, Sees Fiscal Risks Receding
Standard & Poor's went out on a limb in August 2011 when it downgraded the U.S. credit rating to AA+ from AAA and said further cuts could be forthcoming. Monday, the ratings agency said things are looking a bit better for Uncle Sam these days, revising its outlook on that rating to stable, from negative.
June 10, 2013 - Forbes

John Warner in ABC News
We simply cannot, as a nation, stand and put our troops at continuous risk of loss of life and limb without beginning to take some decisive action which will get everybody's attention,Warner told reporters following a visit to Iraq.
John McCain in 940 News
I faced in Vietnam, at times, very real threats to life and limb,McCain told The Associated Press. "But while my sense of honour was tested in prison, it was not questioned. During the Keating inquiry, it was, and I regretted that very...
Paul Azinger in ESPN
Mickelson called me personally and said he'd love to play with [Kim], but so did about six other guys,Azinger said. "I said, 'Way to go out on a limb, Phil. You want Anthony Kim? Really?' "