found: ITIS, Oct. 18, 2000(Viperidae. Common names: pit vipers, vipers. Suborder Serpentes, Order Squamata)
found: The EMBL reptile database, via WWW, Oct. 18, 2000(Family Viperidae (Vipers and Pit Vipers). Superfamily Xenophidia (Colubroidea Caenophidia), Order Squamata; viperids; vipers; pit vipers (subfamily Crotalinae), pitless vipers (subfamilies Viperinae and Azemiopinae))
found: Web. 3(viper 1 a: a common European venomous snake (Vipera berus); broadly: any snake of the venomous Old World family Viperidae and sometimes the closely related Crotalidae)
found: Random House(viper 1) any of several venomous Old World snakes of the genus Vipera 2) any related snakes belonging to the family Viperidae 3) see pit viper)
