Webster's English Dictionary

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vanish

van.ish \'van-ish\ vi [ME vanisshen, fr. MF evaniss-, stem of evanir, fr. 
   (assumed)] VL exvanire, alter. of L evanescere to dissipate like vapor, 
   anish, fr. e- + vanescere to vanish, fr. vanus empty 1a: to pass quickly 
   from sight : DISAPPEAR  1b: to pass completely from existence  2: to assume 
   the value zero  - van.ish.er n