Source : Webster's Revised Unabridged Dictionary (1913)

Cough \Cough\, n. [Cg. D. kuch. See {Cough}, v. i. ]
   1. A sudden, noisy, and violent expulsion of air from the
      chest, caused by irritation in the air passages, or by the
      reflex action of nervous or gastric disorder, etc.

   2. The more or less frequent repetition of coughing,
      constituting a symptom of disease.

   {Stomach cough}, {Ear cough}, cough due to irritation in the
      stomach or ear.