root canal

  1. a small, tubular channel, normally filled with pulp, in the root of a tooth
  2. a treatment or procedure involving the opening, cleaning, filling, etc. of a root canal

See root canal in American Heritage Dictionary 4

noun
  1. A pulp-filled channel in a root of a tooth.
  2. A treatment in which diseased tissue from this part of the tooth is removed and the resulting cavity is filled with an inert material.

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