Source : Webster's Revised Unabridged Dictionary (1913)

Wind-broken \Wind"-bro`ken\, a.
   Having the power of breathing impaired by the rupture,
   dilatation, or running together of air cells of the lungs, so
   that while the inspiration is by one effort, the expiration
   is by two; affected with pulmonary emphysema or with heaves;
   -- said of a horse. --Youatt.