root canal

English Thesaurus

1. the passage in the root of a tooth through which its nerve and blood vessels enter the pulp cavity (noun.body)

hypernym	:	passage, passageway,
definition	:	a path or channel or duct through or along which something may pass (noun.body)

part meronym	:	pulp cavity,
definition	:	the central cavity of a tooth containing the pulp (including the root canal) (noun.body)