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Medical Term:

black tongue


  1. in canines, a disorder associated with a deficency of nicotinic acid.
  2. black to yellowish-brown discoloration of the dorsum of the tongue due to staining by exogenous material such as the components of tobacco; usually superimposed on hairy tongue.

Synonym(s): black hairy tongue, lingua nigra, melanoglossia, nigrities linguae

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