Source : Webster's Revised Unabridged Dictionary (1913)

Dor \Dor\, n. [Cf. AS. dora drone, locust, D. tor beetle, L.
   taurus a kind of beetle. Cf. {Dormouse}.] (Zo["o]l.)
   A large European scaraboid beetle ({Geotrupes stercorarius}),
   which makes a droning noise while flying. The name is also
   applied to allied American species, as the {June bug}. Called
   also {dorr}, {dorbeetle}, or {dorrbeetle}, {dorbug},
   {dorrfly}, and {buzzard clock}.