Definition of fluke

• n. - The European flounder. See Flounder.
• n. - A parasitic trematode worm of several species, having a flat, lanceolate body and two suckers. Two species (Fasciola hepatica and Distoma lanceolatum) are found in the livers of sheep, and produce the disease called rot.
• n. - The part of an anchor which fastens in the ground; a flook. See Anchor.
• n. - One of the lobes of a whale's tail, so called from the resemblance to the fluke of an anchor.
• n. - An instrument for cleaning out a hole drilled in stone for blasting.
• n. - An accidental and favorable stroke at billiards (called a scratch in the United States); hence, any accidental or unexpected advantage; as, he won by a fluke.