the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. See dentin.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. bone (calcified tissue) surrounding the pulp cavity of a tooth
n. a calcareous material harder and denser than bone that comprises the bulk of a tooth
Word Usage
"Surrounding the cavity on all sides is the hard substance known as the dentine, or tooth ivory."