Medical Definition of copperhead
1: 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
2: a very venomous but sluggish Australian elapid snake of the genus Denisonia (D. superba)
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