Source : Webster's Revised Unabridged Dictionary (1913)

Amenorrhoea \A*men`or*rh[oe]"a\, n. [Gr. 'a priv. + ? month + ?
   to flow: cf. F. am['e]norrh['e]e.] (Med.)
   Retention or suppression of the menstrual discharge.

Source : WordNet®

amenorrhoea
     n : absence or suppression of normal menstrual flow [syn: {amenorrhea},
          {amenia}]