Source : Webster's Revised Unabridged Dictionary (1913)

Anosmia \A*nos"mi*a\, n. [NL., fr. Gr. 'an priv. + ? smell.]
   (Med.)
   Loss of the sense of smell.

Source : WordNet®

anosmia
     n : absence of the sense of smell (as by damage to olfactory
         nasal tissue or the olfactory nerve or by obstruction of
         the nasal passages)