also dentine, the hard substance in teeth, 1836, from comb. form of Latin dens (genitive dentis) "tooth" (see tooth) + chemical suffix -in (2).
dentin den·tin (děn'tĭn) or den·tine (-tēn')n. The main, calcareous part of a tooth, beneath the enamel and surrounding the pulp chamber and root canals.
The hard, bony material beneath the enamel of a tooth. The bulk of a tooth is made up of dentin.