Etymology
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dentin (n.)

also dentine, the bone-like substance in teeth (as distinguished from enamel or pulp), 1836, from combining form of Latin dens (genitive dentis) "tooth" (from PIE root *dent- "tooth") + chemical suffix -in (2). Related: Dentinal.

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Definitions of dentin

dentin (n.)
a calcareous material harder and denser than bone that comprises the bulk of a tooth;
Synonyms: dentine
dentin (n.)
bone (calcified tissue) surrounding the pulp cavity of a tooth;
Synonyms: dentine
From wordnet.princeton.edu