资料来源 : pyDict

牙齿

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Teeth \Teeth\, n.,
   pl. of {Tooth}.

Teeth \Teeth\, v. i. [imp. & p. p. {Teethed}; p. pr. & vb. n.
   {Teething}.]
   To breed, or grow, teeth.

Tooth \Tooth\, n.; pl. {Teeth}. [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,
   Skr. danta; probably originally the p. pr. of the verb to
   eat. [root]239. Cf. {Eat}, {Dandelion}, {Dent} the tooth of a
   wheel, {Dental}, {Dentist}, {Indent}, {Tine} of a fork,
   {Tusk}. ]
   1. (Anat.) One of the hard, bony appendages which are borne
      on the jaws, or on other bones in the walls of the mouth
      or pharynx of most vertebrates, and which usually aid in
      the prehension and mastication of food.

   Note: The hard parts of teeth are principally made up of
         dentine, or ivory, and a very hard substance called
         enamel. These are variously combined in different
         animals. Each tooth consist of three parts, a crown, or
         body, projecting above the gum, one or more fangs
         imbedded in the jaw, and the neck, or intermediate
         part. In some animals one or more of the teeth are
         modified into tusks which project from the mouth, as in
         both sexes of the elephant and of the walrus, and in
         the male narwhal. In adult man there are thirty-two
         teeth, composed largely of dentine, but the crowns are
         covered with enamel, and the fangs with a layer of bone
         called cementum. Of the eight teeth on each half of
         each jaw, the two in front are incisors, then come one
         canine, cuspid, or dog tooth, two bicuspids, or false
         molars, and three molars, or grinding teeth. The milk,
         or temporary, teeth are only twenty in number, there
         being two incisors, one canine, and two molars on each
         half of each jaw. The last molars, or wisdom teeth,
         usually appear long after the others, and occasionally
         do not appear above the jaw at all.

               How sharper than a serpent's tooth it is To have
               a thankless child !                --Shak.

   2. Fig.: Taste; palate.

            These are not dishes for thy dainty tooth. --Dryden.

   3. Any projection corresponding to the tooth of an animal, in
      shape, position, or office; as, the teeth, or cogs, of a
      cogwheel; a tooth, prong, or tine, of a fork; a tooth, or
      the teeth, of a rake, a saw, a file, a card.

   4.
      (a) A projecting member resembling a tenon, but fitting
          into a mortise that is only sunk, not pierced through.
      (b) One of several steps, or offsets, in a tusk. See
          {Tusk}.

资料来源 : WordNet®

teeth
     n : the kind and number and arrangement of teeth (collectively)
         in a person or animal [syn: {dentition}]

tooth
     n 1: hard bonelike structures in the jaws of vertebrates; used
          for biting and chewing or for attack and defense
     2: something resembling the tooth of an animal
     3: toothlike structure in invertebrates found in the mouth or
        alimentary canal or on a shell
     4: a means of enforcement; "the treaty had no teeth in it"
     5: one of a number of uniform projections on a gear
     [also: {teeth} (pl)]

teeth
     See {tooth}