The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   2. The more or less frequent repetition of coughing,
      constituting a symptom of disease.
      [1913 Webster]

   Stomach cough, Ear cough, cough due to irritation in the
      stomach or ear.
      [1913 Webster]