The Collaborative International Dictionary
Fluke \Fluke\ (fl[=u]k or fl[=oo]k), n. [Cf. AS. fl[=o]c a kind of flatfish, Icel. fl[=o]ki a kind of halibut.]
(Zo["o]l.) Any American flounder of the genus Paralichthys, especially Paralicthys dentatus, found in the Atlantic Ocean and in adjacent bays.
(Zo["o]l.) 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.
n. (archaic form of fluke English) (type of worm)