one of the hard bony appendages that are borne on the jaws or in many of the lower vertebrates on other bones in the walls of the mouth or pharynx and serve especially for the prehension and mastication of food and as weapons of offense and defense. any of various usually hard and sharp processes especially about the mouth of an invertebrate. a projection resembling or suggesting the tooth of an animal in shape, arrangement, or action: such as any of the regular projections on the circumference or sometimes the face of a wheel that engage with corresponding projections on another wheel especially to transmit force: COG - a small sharp-pointed marginal lobe or process on a plant. effective means of enforcement. something that injures, tortures, devours, or destroys. TASTE, LIKING. a roughness of surface produced by mechanical or artificial means.