'Madman' definitions:

Definition of 'madman'

From: WordNet
noun
An insane person [syn: lunatic, madman, maniac]

Definition of 'Madman'

From: GCIDE
  • Madman \Mad"man\, n.; pl. Madmen. A man who is mad; lunatic; a crazy person. [1913 Webster]
  • When a man mistakes his thoughts for person and things, he is mad. A madman is properly so defined. --Coleridge. [1913 Webster]