Source : Webster's Revised Unabridged Dictionary (1913)

Thor \Thor\, n. [Icel. [thorn][=o]rs. Cf. {Thursday}.] (Scand.
   Myth.)
   The god of thunder, and son of Odin.

Source : WordNet®

Thor
     n : (Norse mythology) god of thunder and rain and farming;
         pictured as wielding a hammer emblematic of the
         thunderbolt; identified with Teutonic Donar