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tooth

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A tooth is the hard, small, white parts covered in enamel and set in the jaw or something that resembles them in structure or function. (noun)

An example of a tooth is the tool in the mouth used to bite and chew.
An example of a tooth is one of the long, fine ends of a comb.

See tooth in Webster's New World College Dictionary

noun pl. teeth

1. any of a set of hard, bonelike structures set in the jaws of most vertebrates and used for biting, tearing, and chewing: a tooth consists typically of a sensitive, vascular pulp surrounded by dentin and coated on the crown with enamel and on the root with cementum: normally 32 are in the permanent set and 20 in the deciduous set of a human
2. any of various analogous processes in invertebrates
3. denture (sense )
something resembling a tooth; toothlike part, as on a saw, fork, rake, gearwheel, etc.; tine, prong, cog, etc.
appetite or taste for something specified: now only in sweet tooth
something that bites, pierces, or gnaws like a tooth: the teeth of the storm
a rough surface, as on paper, metal, etc.
a sound or effective means of enforcing something: to put teeth into a law
Bot. any small, pointed lobe, as of a leaf or of the fringe surrounding the opening of a capsule in mosses

transitive verb

to provide with teeth
to make jagged; indent

intransitive verb

to mesh, or become interlocked, as gears

Related Forms:

toothless adjective

See tooth in American Heritage Dictionary 4

(to͞oth)

noun pl. teeth teeth (tēth)

a. One of a set of hard, bonelike structures rooted in sockets in the jaws of vertebrates, typically composed of a core of soft pulp surrounded by a layer of hard dentin that is coated with cementum or enamel at the crown and used for biting or chewing food or as a means of attack or defense.
b. A similar structure in invertebrates, such as one of the pointed denticles or ridges on the exoskeleton of an arthropod or the shell of a mollusk.
A projecting part resembling a tooth in shape or function, as on a comb, gear, or saw.
A small, notched projection along a margin, especially of a leaf. Also called dent².
A rough surface, as of paper or metal.
a. Something that injures or destroys with force. Often used in the plural: the teeth of the blizzard.
b. teeth Effective means of enforcement; muscle: “This . . . puts real teeth into something where there has been only lip service” (Ellen Convisser).
Taste or appetite: She always had a sweet tooth.

verb (to͞oth, to͞oÞ) toothed toothed, tooth·ing, tooths

verb, transitive

To furnish (a tool, for example) with teeth.
To make a jagged edge on.

verb, intransitive

To become interlocked; mesh.

Word History: Eating, biting, teeth, and dentists are related not only logically but etymologically; that is, the roots of the words eat, tooth, and dentist have a common origin. The Proto-Indo-European root *ed-, meaning “to eat” and the source of our word eat, originally meant “to bite.” A participial form of *ed- in this sense was *dent-, “biting,” which came to mean “tooth.” Our word tooth comes from *dont-, a form of *dent-, with sound changes that resulted in the Germanic word *tanthuz. This word became Old English tōth and Modern English tooth. Meanwhile the Proto-Indo-European form *dent- itself became in Latin dēns (stem dent-), “tooth,” from which is derived our word dentist. We find a descendant of another Proto-Indo-European form *(o)dont- in the word orthodontist.

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