1 The triangular shape at the end of each arm of an anchor which, by digging into the ground when any strain or pull comes on it, gives the anchor its holding power. They are also sometimes called palms. Many seamen do not sound the ‘k’, pronouncing it as ‘flue’. For illus. see anchor.
2 The two triangular parts which make up the tail of a whale. It was this which gave those involved in whaling during the days of sailing whalers the expression of ‘fluking’. This meant the whalers were running free with the foresail goose winged on the opposite side to the mainsail.