\Mer"ry*thought`\, n.
The forked bone of a fowl's breast; -- called also
{wishbone}. See {Furculum}.
Note: It is a sportive custom for two persons to break this
      bone by pulling the ends apart to see who will get the
      longer piece, the securing of which is regarded as a
      lucky omen, signifying that the person holding it will
      obtain the gratification of some secret wish.