noun Each of a set of hard, bony enamel-coated structures in the jaws of most vertebrates, used for biting and chewing. A projecting part on a tool or other instrument, especially one of a series that function or engage together, such as a cog on a gearwheel or a point on a saw or comb. An appetite or liking for a particular thing. (what a tooth for fruit a monkey has!) Roughness given to a surface to allow color or glue to adhere.