tooth

A hard, calcareous structure present in the mouth of many vertebrate animals, generally used for eating.

A sharp projection on the blade of a saw or similar implement.

A projection on the edge of a gear that meshes with similar projections on adjacent gears, or on the circumference of a cog that engages with a chain.

(zoology) A projection or point in other parts of the body resembling the tooth of a vertebrate animal.

(botany) A pointed projection from the margin of a leaf.

(animation) The rough surface of some kinds of cel or other films that allows better adhesion of artwork.

(figuratively) Liking, fondness (compare toothsome).

(algebraic geometry) An irreducible component of a comb that intersects the handle in exactly one point, that point being distinct from the unique point of intersection for any other tooth of the comb.