Webster's English Dictionary

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thursday

Thurs.day \'th*rz-de-\ \-de-z\ n [ME, fr. OE thursdg, fr. ON 
   tho-rsdagr; akin to OE t]hunresdg Thursday, OHG Donares tag; all fr. a 
   prehistoric NGmc-WGmc compound whose components are represented by OHG 
   Donar, Germanic god of the sky (fr. thonor, donar thunder) and by OHG tag 
   day - more at THUNDER, DAY : the fifth day of the week  - Thurs.days av