Webster's English Dictionary

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monday

Mon.day \'m*n-de-\ \-de-z\ n [ME, fr. OE mo-nandg; akin to OHG 
   ma-natag Monday; b]oth fr. a prehistoric WGmc compound whose components are 
   represented by OE mo-ne moon and by OE dg day - more at MOON : the 
   second day of the week  - Mon.days av