The Collaborative International Dictionary
Jararaca \Jar`a*ra"ca\, n. [Pg., from the native name.] (Zo["o]l.) A poisonous serpent of Brazil ( Bothrops jararaca), about eighteen inches long, and of a dusky, brownish color, variegated with red and black spots.
Wikipedia
Bothrops jararaca — known as the jararaca (or the yarara) — is a species of pit viper endemic to southern Brazil, Paraguay, and northern Argentina. The specific name, jararaca, is derived from the Tupi words yarará and ca, which mean "large snake". Within its geographic range, it is often abundant and is an important cause of snakebite. No subspecies are currently recognized.
The drugs known as angiotensin converting enzyme (ACE) inhibitors, used for the treatment of hypertension and some types of congestive heart failure, were developed from a peptide found in the venom of this species.