A heavy device of iron or steel used to secure a vessel or buoy at a desired location. It comprises a shank with, at one end, a shackle or ring to which the mooring line of the vessel or buoy is attached and, at the other end, flukes that can grip the sea bottom. A crosspiece called the stock may be fitted transversely to the shank, to cant the anchor when the mooring line is tensioned.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM