1. A cavity in the secondary wall of a plant cell, formed where secondary deposition has failed to occur, and the primary wall remains uncovered; two main types are simple pits and bordered pits.

2. The stone of a drupaceous fruit.

A small hole in the surface of a metal; usually caused by corrosion or formed during electroplating operations.

1. A coal mine; the term is not commonly used by the coal industry, except in reference to surface mining where the workings may be known as a strip pit.

2. Any quarry, mine, or excavation area worked by the open-cut method to obtain material of value.