In a viperous manner.

plural of Russell's viper

plural of temple viper

Tropidolaemus wagleri, a venomous pit viper native to Southeast Asia.

plural of shore pit viper

(biochemistry) A protein that inhibits viruses

(rare, non-native) Of, belonging to, or relating to viperids.

(idiomatic) to do acts of kindness that will be met with ingratitude and will cause one harm in the end

plural of horned viper

Cerastes spp., North African desert vipers. / Bitis caudalis, the horned puff adder or horned adder, of south-west Africa. / Vipera ammodytes, the sand viper.