'Fluke' definitions:

Definition of 'fluke'

noun

A stroke of luck [syn: good luck, fluke, good fortune]

noun

A barb on a harpoon or arrow

noun

Flat bladelike projection on the arm of an anchor [syn: fluke, flue]

noun

Either of the two lobes of the tail of a cetacean

noun

Parasitic flatworms having external suckers for attaching to a host [syn: fluke, trematode, trematode worm]

From: GCIDE

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.]
1. (Zool.) The European flounder. See Flounder. [Written also fleuk, flook, and flowk.] [1913 Webster]
2. (Zool.) Any American flounder of the genus Paralichthys, especially Paralicthys dentatus, found in the Atlantic Ocean and in adjacent bays. --RHUD [PJC]
3. (Zool.) 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. [1913 Webster]

From: GCIDE

Fluke \Fluke\ (fl[=u]k), n. [Cf. LG. flunk, flunka wing, the palm of an anchor; perh. akin to E. fly.]
1. The part of an anchor which fastens in the ground; a flook. See Anchor. [1913 Webster]
2. (Zool.) One of the lobes of a whale's tail, so called from the resemblance to the fluke of an anchor. [1913 Webster]
3. An instrument for cleaning out a hole drilled in stone for blasting. [1913 Webster]
4. An accidental and favorable stroke at billiards (called a scratch in the United States); hence, any accidental or unexpected advantage; as, he won by a fluke. [Cant, Eng.] --A. Trollope. [1913 Webster]

From: GCIDE

Fluke \Fluke\, v. t. & i. [imp. & p. p. Fluked; p. pr. & vb. n. Fluking.] To get or score by a fluke; as, to fluke a play in billiards. [Slang] [Webster 1913 Suppl.]