the european flounder.  see flounder.-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.-the part of an anchor which fastens in the ground; a flook. see anchor.-one of the lobes of a whale's tail, so called from the resemblance to the fluke of an anchor.-an instrument for cleaning out a hole drilled in stone for blasting.-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.