1.nounA lucky or improbable occurrence, with the implication that the occurrence could not be repeated.
"The first goal was just a fluke."
2.nounA flounder.
3.nounA trematode; a parasitic flatworm of the Trematoda class, related to the tapeworm.
"The man had become infected with flukes after eating a meal of raw fish."
4.nounEither 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."
5.nounAny 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."
6.nounA 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."
7.nounIn general, a winglike formation on a central piece.
"After casting the bronze statue, we filed down the flukes and spurs from the molding process."