One of the hard bony structures supported by the jaws in mammals and by other bones of the mouth and pharynx in lower vertebrates serving principally for prehension and mastication.

1. One of the regular projections on the edge or face of a gear wheel.

2. An angular projection on a tool or other implement, such as a rake, saw, or comb.

1. The coarse or abrasive quality of a paper or a painting ground that assists in the application of charcoal, pastels, or paint.

2. A paper texture that holds ink more readily.

Any of various sharp, horny, chitinous, or calcareous processes on or about any part of an invertebrate that functions like or resembles vertebrate jaws.