Tooth
The structures within the mouth that allow for biting and chewing. Teeth have different shapes, depending on their purpose. The sharp canine and frontal teeth allow for biting, while the flattened, thick molars in the back of the mouth provide grinding surfaces for masticating food. All teeth have essentially the same structure: a hard crown above the gum line, which is attached to two or four roots by a portion called the neck. The roots are covered with a very thin layer of bone, and keep the tooth embedded in the bones of the jaw. The exposed exterior of the tooth is covered with tough enamel. Under the enamel is a thick layer of dentin, and in the center is the pulp. Blood vessels and nerves are found within the pulp.
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Howard H., English physician, 1856–1925. See Charcot-Marie-T. disease.

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tooth 'tüth n, pl teeth 'tēth any of the hard bony appendages that are borne on the jaws and serve esp. for the prehension and mastication of food see MILK TOOTH, PERMANENT TOOTH

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n. (pl. teeth)
one of the hard structures in the mouth used for cutting and chewing food. Each tooth is embedded in a socket in part of the jawbone (mandible or maxilla) known as the alveolar bone (or alveolus), to which it is attached by the periodontal membrane. The exposed part of the tooth (crown) is covered with enamel and the part within the bone (root) is coated with cementum; the bulk of the tooth consists of dentine enclosing the pulp. The group of embryological cells that gives rise to a tooth is known as the tooth germ.
There are four different types of tooth (see canine, incisor, premolar, molar). See also dentition.

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(tth) pl. teeth [L. dens; Gr. odous] 1. any of the hard calcified structures set in the alveolar processes of the mandible and maxilla for mastication of food. In humans, there are two sets of teeth (dentes [TA]), deciduous and permanent. Each tooth consists of three parts: the crown (see corona dentis), the neck (see cervix dentis), and the root (see radix dentis). The solid part includes dentin, forming most of the tooth and resembling true bone; enamel, a very hard inorganic substance, covering the crown; and cementum, covering the root. In the center is the soft pulp (see pulpa dentis). See also dentition. 2. a structure resembling the tooth of an animal.

Schematic cross section of an anterior (left) and a posterior (right) tooth in the maxilla.


Medical dictionary. 2011.

Look at other dictionaries:

  • Tooth — (t[=oo]th), n.; pl. {Teeth} (t[=e]th). [OE. toth,tooth, AS. t[=o][eth]; akin to OFries. t[=o]th, OS. & D. tand, OHG. zang, zan, G. zahn, Icel. t[ o]nn, Sw. & Dan. tand, Goth. tumpus, Lith. dantis, W. dant, L. dens, dentis, Gr. odoy s, odo ntos,… …   The Collaborative International Dictionary of English

  • tooth — tooth; tooth·er; tooth·ful; tooth·i·ly; tooth·ing; tooth·less; tooth·let; tooth·pick·er; tooth·some; tooth·some·ly; tooth·some·ness; un·tooth; tooth·less·ly; tooth·less·ness; …   English syllables

  • tooth — W2S2 [tu:θ] n plural teeth [ti:θ] ↑ear, ↑nose, ↑tooth, ↑eye ▬▬▬▬▬▬▬ 1¦(in mouth)¦ 2¦(on a tool etc)¦ 3¦(power)¦ 4 fight tooth and nail 5 get your teeth into something …   Dictionary of contemporary English

  • tooth — [to͞oth; ] for v., also [ to͞oth] n. pl. teeth [tēth] [ME < OE toth (< * tanth), akin to Ger zahn < IE * edont (< base * ed , to eat) > L dens (gen. dentis), Gr odous (gen. odontos)] 1. a) any of a set of hard, bonelike structures… …   English World dictionary

  • tooth — [ tuθ ] (plural teeth [ tiθ ] ) noun count *** 1. ) any of the hard white objects inside your mouth that you use for biting and for CHEWING food: front/back teeth a loose/missing/broken tooth brush/clean your teeth: It s important to brush your… …   Usage of the words and phrases in modern English

  • Tooth — Tooth, v. t. [imp. & p. p. {Toothed}; p. pr. & vb. n. {Toothing}.] 1. To furnish with teeth. [1913 Webster] The twin cards toothed with glittering wire. Wordsworth. [1913 Webster] 2. To indent; to jag; as, to tooth a saw. [1913 Webster] 3. To… …   The Collaborative International Dictionary of English

  • tooth — (n.) O.E. toð (plural teð), from P.Gmc. *tanth, *tunth (Cf. O.S., Dan., Swed., Du. tand, O.N. tönn, O.Fris. toth, O.H.G. zand, Ger. Zahn, Goth. tunþus), from PIE *dont /*dent tooth (Cf. Skt. danta, Gk. odontos …   Etymology dictionary

  • tooth — ► NOUN (pl. teeth) 1) each of a set of hard, bony enamel coated structures in the jaws, used for biting and chewing. 2) a projecting part, especially a cog on a gearwheel or a point on a saw or comb. 3) (teeth) genuine force or effectiveness. ●… …   English terms dictionary

  • Tooth — Tooth. См. Зубец. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • Tooth — Infobox Anatomy Name = Teeth Caption = An adult human s teeth. Caption2 = CGI posterior view of teeth taken from inside of mouthTeeth (singular, Tooth) are small whitish structures found in the jaws (or mouths) of many vertebrates that are used… …   Wikipedia

  • tooth — toothlike, adj. /toohth/, n., pl. teeth, v., toothed /toohtht, toohdhd/, toothing /tooh thing, dhing/. n. 1. (in most vertebrates) one of the hard bodies or processes usually attached in a row to each jaw, serving for the prehension and… …   Universalium

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