The Collaborative International Dictionary of English v.0.48:

dental \den"tal\ (d[e^]n"tal), a. [L. dens, dentis, tooth: cf.
   F. dental. See Tooth.]
   1. Of or pertaining to the teeth or to dentistry; as, dental
      surgery.
      [1913 Webster]

   2. (Phon.) Formed by the aid of the teeth; -- said of certain
      articulations and the letters representing them; as, d and
      t are dental letters.
      [1913 Webster]

   Dental formula (Zool.), a brief notation used by zoologists
      to denote the number and kind of teeth of a mammal.

   Dental surgeon, a dentist.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dental \Den"tal\, n. [Cf. F. dentale. See Dental, a.]
   1. An articulation or letter formed by the aid of the teeth.
      [1913 Webster]

   2. (Zool.) A marine mollusk of the genus Dentalium, with a
      curved conical shell resembling a tooth. See Dentalium.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dental
    adj 1: of or relating to the teeth; "dental floss"
    2: of or relating to dentistry; "dental student"
    n 1: a consonant articulated with the tip of the tongue near the
         gum ridge [syn: alveolar consonant, dental consonant,
         alveolar, dental]