Any of various heavy-bodied American pit vipers of the genera Crotalus and Sistrurus, which have a series of horny rings at the end of the tail that…

A rattle-snake; also its rattle.

any of various rattlesnakes of the North American prairies; esp. the Western rattlesnake, Crotalus viridis (sometimes spec. the subspecies C. v. vi…

Originally and chiefly U.S. A rattlesnake.

A small North American rattlesnake, Sistrurus catenatus, which favours damp habitats. Also massasauga rattlesnake, massasauga rattler.

Also Mississauga rattler. = massasauga, n. rare.

the tree boa, Corallus hortulanus.

U.S. colloquial. Any of several rattlesnakes of the south-western United States, spec. the massasauga, Sistrurus catenatus.

= prairie rattlesnake n.

(see quot.).