bull snake

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of several large, nonvenomous North American snakes of the genus Pituophis that have yellow and brown or black markings and feed chiefly on rodents. Also called gopher snake.

Century Dictionary and Cyclopedia

1. n. A popular name in the United States for a serpent of the genus Pityophis, or pine-snake, which sometimes grows to the length of 6 feet, and makes a loud hissing noise when disturbed, but is of mild disposition and not poisonous.

GNU Webster's 1913

1. adj. (Zoöl.) the pine snake of the United States.
2. n. any of several large harmless rodent-eating North American burrowing snakes of the genus Pituophis. They include the gopher snake and pine snake.

WordNet 3.0

1. n. any of several large harmless rodent-eating North American burrowing snakes
2. n. any of several large harmless rodent-eating North American burrowing snakes