ocffer -
n. 1 a
box, esp. a large strongbox for valuables.
2 (in pl.) a treasury or store of funds.
3 a sunken panel in a ceiling etc.
coffer-dam a watertight enclosure pumped dry to permit work below the waterline on building bridges etc., or for repairing a ship.
coffered adj. [ME f. OF coffre f. L cophinus f. Gk kophinos basket]