The Collaborative International Dictionary of English v.0.48:

Dor \Dor\, n. [Cf. AS. dora drone, locust, D. tor beetle, L.
   taurus a kind of beetle. Cf. Dormouse.] (Zool.)
   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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dor \Dor\, n. [Cf. Dor a beetle, and Hum, Humbug.]
   A trick, joke, or deception. --Beau. & Fl.
   [1913 Webster]

   To give one the dor, to make a fool of him. [Archaic] --P.
      Fletcher.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dor \Dor\, v. t.
   To make a fool of; to deceive. [Obs.] [Written also dorr.]
   --B. Jonson.
   [1913 Webster]