Emily Dickinson Lexicon

TED'DER, n. [W. tid, a chain; Ir. tead, teidin; Gaelic, tead, teidin, teud, a chain, cord or rope; Sw. tiuder; probably from extending. See Ted.]

1. A rope or chain by which an animal is tied that he may feed on the ground to the extent of the rope and no further. Hence the popular saying, a person has gone to the length of his tedder.
2. That by which one is restrained. Child.