copperhead /kop″ərhed′/ [L, cuprum + ME, hed] , a poisonous pit viper (Agkistrodon contortrix) found mainly in the southeastern United States. The reddish brown, darkly banded snake is responsible for nearly 40% of the snakebites in the United States. Few bites are fatal. Pain, swelling, fang marks, and a bruise are usually present. Immediate treatment includes keeping the victim quiet and immobilizing the bite area at the level of the heart while seeking medical attention. Antivenin is available but is rarely indicated. See also coral snake, cottonmouth, rattlesnake.
