Source : Webster's Revised Unabridged Dictionary (1913)

Dentine \Den"tine\, n. [Cf. F. dentine.] (Anat.)
   The dense calcified substance of which teeth are largely
   composed. It contains less animal matter than bone, and in
   the teeth of man is situated beneath the enamel.

Source : WordNet®

dentine
     n 1: a calcareous material harder and denser than bone that
          comprises the bulk of a tooth [syn: {dentin}]
     2: bone (calcified tissue) surrounding the pulp cavity of a
        tooth [syn: {dentin}]