Webster’s Revised Unabridged Dictionary · 1913
Edder
Ed′der (ĕd′dẽr), n. [See Adder.] (Zoöl.) An adder or serpent. [Prov. Eng.] Wright.
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.
Ed′der, v. t. To bind the top interweaving edder; as, to edder a hedge. [Obs.]