Fluke

Part of speech: noun (n.)

1. The part of an anchor which fastens in the ground; a flook. See Anchor.

2. 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.