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viper Definition
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viper
noun(vi-per)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
viper
noun(vi-per)a venomous or reputedly venomous snake
viper
noun(vi-per)a vicious or treacherous person
viper
noun(vi-per)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
viper
noun(vi-per)a venomous viper (Cerastes cerastes synonym C. cornutus) of North Africa and the Middle East having a horny process over each eye
viper
noun(vi-per)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