Source : Webster's Revised Unabridged Dictionary (1913)

Dyspnoea \Dysp*n[oe]"a\, n. [L., fr. Gr. ?, fr. ? short of
   breath; pref. ? ill, hard + ?, ?, breathing, ? to blow,
   breathe: cf. F. dyspn['e]e.] (Med.)
   Difficulty of breathing.

Source : WordNet®

dyspnoea
     n : difficult or labored respiration [syn: {dyspnea}]