(engineering) A type of watertight enclosure used to create a dry foundation for building bridges and other structures over water.

plural of coffer-dam

plural of coffer illusion

An optical illusion in which an arrangement of horizontal and vertical bars of various lengths may be viewed as either a series of rectangles or a series of circles.

A temporary watertight structure that is pumped dry to enclose an area underwater and allow construction work on a ship, bridge, or rig to be carried out; a caisson.

plural of cofferdam

(masonry) rubblework faced with stone

boxfish

plural of cofferfish

Resembling or characteristic of a coffer.