(French; "spearhead") Extremely venomous pit viper (genus Bothrops), found in diverse tropical American habitats, from cultivated lands to forests. It has a broad, triangular head and is gray or brown, marked by a series of black-edged diamonds often bordered in a lighter colour. It is usually about 4-7 ft (1.2-2 m) long. Its bite can be fatal to humans. The name is sometimes applied to all members of the Central and South American genus Bothrops and to an Asian genus, Trimeresurus