The d in Modern English thunder (from earlier Old English ŝunor) is epenthetic, and is now found as well in Modern Dutch donder (cp Middle Dutch donre, and Old Norse ŝorr, Old Frisian ŝuner, Old High German donar descended from Proto-Germanic *ŝunraz). In Latin the term was tonare "to thunder" (see also tornado). The name of the Germanic god Thor comes from the Old Norse word for thunder.
The shared Proto-Indo-European root is *tón-r̥ or *tar-, also found Gaulish Taranis and Hittite Tarhunt.
Kirk Sanford GCA
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Subject: Etymology... 
Fri Dec 31, 2010 1:22 pm