Main entry: fluke, trematode, trematode worm
Definition: parasitic flatworms having external suckers for attaching to a host
Main entry: fluke
Definition: either of the two lobes of the tail of a cetacean
Definition: flat bladelike projection on the arm of an anchor
Main entry: fluke
Definition: a barb on a harpoon or arrow
Main entry: fluke, good fortune, good luck
Definition: a stroke of luck