I. ˈflük noun
Etymology: Middle English floke, fluke, from Old English flōc; akin to Old English flōh chip, Old High German flah smooth, Greek plax flat surface, and probably to Old English flōr floor — more at floor
Date: before 12th century
1. : flatfish
2. : a flattened digenetic trematode worm ; broadly : trematode — compare liver fluke
II. noun
Etymology: perhaps from fluke (I)
Date: 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
III. noun
Etymology: origin unknown
Date: 1857
1. : an accidentally successful stroke at billiards or pool
2. : a stroke of luck
the discovery was a fluke