one who, or that which, directs; one who regulates, guides, or orders; a manager or superintendent.-one of a body of persons appointed to manage the affairs of a company or corporation; as, the directors of a bank, insurance company, or railroad company.-a part of a machine or instrument which directs its motion or action.-a slender grooved instrument upon which a knife is made to slide when it is wished to limit the extent of motion of the latter, or prevent its injuring the parts beneath.