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 un...