Medical Dictionary
viper
noun vi·per \ˈvī-pər\
Medical Definition of VIPER
1
: a common Eurasian venomous snake of the genus Vipera (V. berus) that attains a length of about two feet (0.6 meter), varies in color from red, brown, or gray with dark markings to black, and whose bite is usually not fatal to humans; broadly : any snake of an Old World subfamily (Viperinae) of the family Viperidae
2
3
: a venomous or reputedly venomous snake
Seen & Heard
What made you want to look up viper? Please tell us where you read or heard it (including the quote, if possible).