A pilonidal cyst is a unique kind of abscess that occurs in or above the crease of the buttocks. Pilonidal cysts often begin as tiny areas of infection in the base of the area of skin from which hair grows (the hair follicle).
Cofferdam A cofferdam is a temporary enclosure built within, or in pairs across, a body of water and constructed to allow the enclosed area to be pumped out, creating a dry work environment for the major work to proceed.
Definition: In architecture, a coffer is a sunken panel in a ceiling (including the interiors of domes and vaults). The word comes from the ancient Greek word kophinos, which means basket..The Latin word for basket, cophinus, was adopted by the old French to mean various types of hollowed containers.he Latin word capsa, meaning box, evolved into the words caisson (an ammunition chest) and casket (same as coffin). Caisson ceiling is sometimes used to describe this type of ceiling hollow. The Chinese name for this type of ceiling, zaojing, means a well for plants that grow in water.