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Vi·per·i·dae

n pl :  a widely distributed family comprising heavy-bodied venomous snakes that include Old World snakes (subfamily Viperinae) and the pit vipers (subfamily Crotalinae) and that are characterized by large tubular venom-conducting fangs erected by rotation of the movable premaxillae - compare CROTALIDAE  vi*per*id adj 
 
 

 
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