: a pit viper (Agkistrodon contortrix) widely distributed in upland areas of the eastern and central United States that typically attains a length of three feet (0.9 meter), is coppery brown above with dark transverse blotches, and is capable of inflicting a very painful but rarely fatal bite
: a very venomous but sluggish Australian elapid snake of the genus Denisonia (D. superba)
Any of several unrelated species of snake named for their reddish head. The North American copperhead (Agkistrodon contortrix), also called the highland moccasin, is a pit viper of swampy, rocky, and wooded regions of the central and eastern U.S. It is usually less than 3 ft (1 m) long and is pinkish or reddish with a copper-coloured head and reddish brown, often hourglass-shaped crossbands on its back. Its venom is relatively weak, and a bite is rarely fatal to humans. The Australian copperhead is an elapid, and the Indian copperhead is a rat snake.