Webster's English Dictionary

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dementia

Cross references:
  1. insanity              
 
de.men.tia \di-'men-ch*\ \-ch*l\ n [L, fr. dement-, demens mad, fr. de- + 
   ment-, mensX mind 1: a condition of deteriorated mentality  2: MADNESS, 
   INSANITY  - de.men.tial aj