The Collaborative International Dictionary of English v.0.48:

Perambulate \Per*am"bu*late\, v. t. [imp. & p. p.
   Perambulated; p. pr. & vb. n. Perambulating.] [L.
   perambulatus, p. p. of perambulare to perambulate; per
   through + ambulare to walk. See Per-, and Amble.]
   To walk through or over; especially, to travel over for the
   purpose of surveying or examining; to inspect by traversing;
   specifically, to inspect officially the boundaries of, as of
   a town or parish, by walking over the whole line.
   [1913 Webster]