The Collaborative International Dictionary of English v.0.48:

Troad \Troad\, n.
   See Trode. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Trode \Trode\, n. [AS. trod, fr. tredan to tread. See Tread.]
   Tread; footing. [Written also troad.][Obs.] --Spenser.
   [1913 Webster]