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viper

vi·per [ vpər ] (plural vi·pers)


noun 
Definition:
 
1. poisonous snake: a snake with hollow fangs that it uses to inject venom into its victim when it bites. Native to: Europe, Asia, Africa.  Family Viperidae.

2. reptiles 
Same as  adder2


3. poisonous snake not of viper family: a poisonous snake belonging to a family other than that of the true viper, e.g. the horned viper

4. zoology 
Same as  pit viper


5. offensive term: an offensive term for somebody who is considered to be malicious, treacherous, or ungrateful ( offensive literary )

[Early 16th century. Via Old French vipere< Latin vipera "snake," contraction of assumed vivipera "live-bearing" (from the ancient belief that snakes bore live young) < vivus "alive"]

vi·per·ous adjective
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