(sometimes capitalized) Long-standing nickname of a complicated, seemingly man-made excavation on Oak Island in Nova Scotia, Canada, rumored to contain pirate treasure and which has been repeatedly and unsuccessfully probed at great expense.

(anatomy) A deep ciliated fossa on the dorsal midline of the buccal cavity in lancelets.

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.

plural of pit adder

Alternative form of pit adder

plural of eye-pit

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

(military) A trench for sheltering sharpshooters.

plural of rifle pit

The bottom of the abdomen