Source : Webster's Revised Unabridged Dictionary (1913)

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

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.

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