Webster's English Dictionary

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saturday

Sat.ur.day \'sat-*rd-e-\ \-e-z\ n [ME saterday, fr. OE sterndg; 
   akin to OFris sa]-terdei; both fr. a prehistoric WGmc compound whose first 
   component was borrowed fr. L Saturnus Saturn and whose second component is 
   represented by OE dg day : the seventh day of the week  - Sat.ur.days 
   av