plural of pit adder

Any of various venomous snakes of the family Crotalinae, found in Asia and the Americas, with a deep pit or groove on either side of the head which enables them to detect prey by infrared sensing; a pit viper.

Alternative form of pit adder

(now rare) The eye socket; the concave area of the face around each eye.

The bottom of the abdomen

A pit filled with snakes. / (figuratively) Any institution (such as a school, prison, hospital, etc.) run in an inept or inhumane way, or full of hostile or treacherous people.

(military) A trench for sheltering sharpshooters.

(historical) An enclosed space into which rats are placed to be killed by a dog for sport.

The stone of a cherry. / (games, obsolete) A children's game in which players attempt to knock marbles into a hole without losing their taw in the same hole.

(informal) The shallow depression located at the back of the knee joint.