[fluke] n [ME, fr. OE floc; akin to OE floh chip, OHG flah smooth, Gk plax flat surface, and prob. to OE flor floor--more at floor] (bef. 12c) 1: flatfish
2: a flattened digenetic trematode worm; broadly: trematode--compare liver fluke
[2]fluke n [perh. fr. [1]fluke] (1561) 1: the part of an anchor that fastens in the ground--see anchor illustration
2: one of the lobes of a whale's tail [3]fluke n [origin unknown] (1857) 1: an accidentally successful stroke at billiards or pool
2: a stroke of luck "the discovery was a ~"