Webster's English Dictionary

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dandruff

dan.druff \'dan-dr*f\ \-e-\ n [prob. fr. dand- (origin unknown) + -ruff, of 
   Scand origin; akin to] OHN hru-fa scab; akin to OHG hruf scurf, Lith 
   kraupus rough : a scurf that forms on the scalp and comes off in small 
   white or grayish  scales - dan.druffy aj