Jararaca n. : A poisonous serpent of Brazil (Bothrops jararaca), about eighteen inches long, and of a dusky, brownish color, variegated with red and black spots.

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Taxonomy
Bothrops jararaca, venom, Wied-Neuwied, snakebite, species, Common names, free encyclopedia, yarará, mg/kg, Crotalinae, Venomous Reptiles, Wagler, southern Brazil, northern Argentina, Integrated Taxonomic Information System, Squamata, Serpentes, Viperidae.

Defination from the web:
jararaca is a venomous pitviper species found in southern Brazil, Paraguay and northern Argentina. ... The English common name is jararaca. In Argentina it is called yararaca and yararaca perezosa. ...