fer-de-lance

1. These venomous pit vipers, members of the lancehead, or fer-de-lance, family, are common throughout their range and are responsible for a large number of snakebites in Brazil, Paraguay, and Argentina.
   这种剧毒的蝰蛇是矛头蛇的一种，在其分布地区十分常见，并在巴西，巴拉圭和阿根廷等地造成了大量的毒蛇咬伤事故。

noun

1. large extremely venomous pit viper of Central America and South America

   Synonym:    Bothrops atrops