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

The time measurement resulting from an in vitro diagnostic test based on the ability of the venom of the Russell's viper to induce thrombosis.

Hypnale zara, a species of pit viper endemic to Sri Lanka.

In the manner of a viper. / spiteful; treacherous

Of, relating to or resembling a viper

Any viper of the subfamily Viperinae

plural of viperid

(zoology) Any member of the family Viperidae; a viper.

Resembling or characteristic of a viper.

A deepwater fish of the genus Chauliodus, a fierce predator with long, needle-like teeth and hinged lower jaws, found mainly in tropical and temperate waters.