Webster's English Dictionary

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fluke

1. fluke \'flu:k\ n [ME, fr. OE flo-c; akin to OHG flah smooth - more at 
   FLAKE)M 1: FLATFISH  2: a flattened digenetic trematode worm; broadly : 
   TREMATODE 
2. fluke n [perh. fr. 1fluke] 1: the part of an anchor that fastens in the 
   ground  2: a barbed head (as of a harpoon)  3: one of the lobes of a 
   whale's tail 
3. fluke n [origin unknown] 1: an accidentally successful stroke at 
   billiards or pool  2: a stroke of luck