fluke

1. Any of the triangular blades at the end of an anchor, designed to catch the ground. · The fluke of the anchor was wedged between two outcroppings of rock and could not be dislodged.
2. Either of the two lobes of a whale's or similar creature's tail. · The dolphin had an open wound on the left fluke of its tail where the propeller had injured it.
3. A metal hook on the head of certain staff weapons (such as a bill), made in various forms depending on function, whether used for grappling or to penetrate armour when swung at an opponent. · The polearm had a wide, sharpened fluke attached to the central point.
4. In general, a winglike formation on a central piece. · After casting the bronze statue, we filed down the flukes and spurs from the molding process.
5. Waste cotton.

Plural flukes