The Collaborative International Dictionary of English v.0.48:
Jumper cable \Jump"er ca`ble\, n. A cable or pair of cables used to jump-start a vehicle. [PJC]WordNet (r) 3.0 (2006):
jumper cable n 1: a jumper that consists of a short piece of wire; "it was a tangle of jumper cables and clip leads" [syn: jumper cable, jumper lead, lead, booster cable]