viper
noun15th century{ds||1|a|}
- a common Eurasian venomous snake (Vipera 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 is usually not fatal to humans; broadly : any of a family (Viperidae) of venomous snakes that includes Old World snakes (subfamily Viperinae) and the pit vipers
- a venomous or reputedly venomous snake
- a vicious or treacherous person
viper's bugloss
noun
viper's bugloss
\
circa 1597
- a coarse Old World herb (Echium vulgare) of the borage family that is naturalized in North America and has showy blue tubular flowers with exserted stamens —called also blueweed
horned viper
noun
horned viper
\
1767
- a venomous viper (Cerastes cerastes synonym C. cornutus) of North Africa and the Middle East having a horny process over each eye
pit viper
noun
pit viper
\
1874
- any of various mostly New World vipers (subfamily Crotalinae of the family Viperidae) with a sensory pit on each side of the head and hollow perforated retractable fangs
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