Viperidae
noun plural
Vi·per·i·dae
vī-ˈper-ə-ˌdē 
: 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
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“Viperidae.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Viperidae. Accessed 23 Nov. 2024.
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