The Collaborative International Dictionary of English v.0.48:

Edder \Ed"der\, n. [See Adder.] (Zo["o]l.)
   An adder or serpent. [Prov. Eng.] --Wright.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Edder \Ed"der\, n. [AS. edor hedge, fence; akin to etar.]
   Flexible wood worked into the top of hedge stakes, to bind
   them together. [Obs.] --Tusser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Edder \Ed"der\, v. t.
   To bind the top interweaving edder; as, to edder a hedge.
   [Obs.]
   [1913 Webster]