Viperine is a 8 letter English word. It's valid Scrabble word worth 13 points. It's valid Words with friends word worth 16 points.
You can make 137 anagrams from letters in viperine (eeiinprv).
From the Latin word vīperīnus, dating back to 1540-50. See viper, -ine1
But your Lamia has taught you some subtle 'viperine' reasoning and motiving, for the turning down one street instead of another.
Here, among a number of viperine snakes of about the same size, is a snake that lives on eggs.
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