Webster’s Revised Unabridged Dictionary · 1913
Fluke
Fluke (flūk), n. [Cf. AS. flōc a kind of flatfish, Icel. flōki a kind of halibut.] 1. (Zoöl.) The European flounder. See Flounder. [Written also fleuk, flook, and flowk]. [1913 Webster]
2. (Zoöl.) 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]
Fluke (flūk), 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.
2. (Zoöl.) One of the lobes of a whale's tail, so called from the resemblance to the fluke of an anchor.
3. An instrument for cleaning out a hole drilled in stone for blasting.
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.