American Heritage Dictionary
(1)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
Elsewhere on the web
"And now if you will shut the door, Carlin A great cry from Carlin answered Thick and viperine, the thing looked, as it hurled forward.— Son of Power
In fact I have long left off thinking that logic proves anything--it doesn't_, you know But your Lamia has taught you some subtle 'viperine' reasoning and motiving_, for the turning down one street instead of another.— The Letters of Robert Browning and Elizabeth Barrett Barrett, Vol. 1 (of 2) 1845-1846
The result will be an amalgam of viperine credentialism and crude collectivism, if such a monster can be imagined.— Yahoo! Answers: Latest Questions
His broad cheekbones and narrow chin gave his face something of the viperine V.— The Door in the Wall and Other Stories

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