plicidentine
/ˌplɪsɪˈdɛntiːn/Palaeontology
noun
Dentine occurring as a series of vertical folds around the central axis of a tooth, as a consequence of which the surface of the tooth has a series of vertical grooves.
Origin
Mid 19th century; earliest use found in William T. Brande (1788–1866), chemist. From post-classical Latin plica + -i- + dentine.