Crotaline is a term that is frequently used to refer to a family of venomous snakes that includes the pit vipers. However, there are a variety of other terms that can be used interchangeably with crotaline or that refer to specific subsets of this group. For example, some people may use the term viperine to describe any snake in the family Viperidae, which includes the crotaline pit vipers. Others might use the term rattlesnake to specifically refer to a type of crotaline that has a distinctive rattle on its tail. Additional synonyms for crotaline might include pit viper, poisonous snake, or venomous serpent.