Webster's English Dictionary

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disease

dis.ease \diz-'e-z\ \-'e-zd\ n [ME disese, fr. MF desaise, fr. des- dis- + 
   aise ease] obs  1: TROUBLE  2a: an impairment of the normal state of the 
   living animal or plant body th at affects the performance of the vital 
   functions : SICKNESS 2b: a particular instance or kind of such impairment : 
   MALADY  - dis.eased aj