The Collaborative International Dictionary of English v.0.48:

Tedder \Ted"der\, n.
   A machine for stirring and spreading hay, to expedite its
   drying.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tedder \Ted"der\, n. [OE. [root]64. See Tether.]
   Same as Tether.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tedder \Ted"der\, v. t. [imp. & p. p. Teddered; p. pr. & vb.
   n. Teddering.]
   Same as Tether.
   [1913 Webster]