caisson Definition

a chest to hold ammunition

a usually 2-wheeled vehicle for artillery ammunition attachable to a horse-drawn limber; also : a limber with its attached caisson

a watertight chamber used in construction work under water or as a foundation

decompression sickness

a sometimes fatal condition that is caused by the release of gas bubbles typically of nitrogen as it leaves its dissolved form throughout the body upon a rapid decrease in barometric pressure (such as that experienced by the rapid ascent of a diver from a deep dive or the rapid ascent of a pilot to high altitudes in a poorly pressurized aircraft) and that is marked chiefly by joint pain which may be accompanied in mild forms by fatigue and itching or burning of the skin and in more severe forms by shortness of breath, chest pain, paralysis, and confusion —called also bends, caisson disease