noun
the passage in the root of a tooth through which its nerve and blood vessels enter the pulp cavity
• Hypernyms: ↑passage, ↑passageway
• Part Holonyms: ↑pulp cavity
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noun, pl ⋯ -nals [count]
: a dental procedure to save a tooth by removing the diseased or injured tissue in its root
I need to have a root canal.
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the space inside the root of a tooth
Useful english dictionary. 2012.