Webster's English Dictionary

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psychosis

Cross references:
  1. insanity              
 
psy.cho.sis \si--'ko--s*s\ \-'ka:t-ik\ \-i-k(*-)le-\ n [NL] : fundamental 
   lasting mental derangement characterized by defective or los t contact with 
   reality - psy.chot.ic ajor ;n