Source : Webster's Revised Unabridged Dictionary (1913)

Obstruct \Ob*struct"\, v. t. [imp. & p. p. {Obstructed}; p. pr.
   & vb. n. {Obstructing}.] [L. obstructus, p. p. of obstruere
   to build up before or against, to obstruct; ob (see {Ob-}) +
   struere to pile up. See {Structure}.]
   1. To block up; to stop up or close, as a way or passage; to
      place an obstacle in, or fill with obstacles or
      impediments that prevent or hinder passing; as, to
      obstruct a street; to obstruct the channels of the body.

            'T is the obstructed paths of sound shall clear.
                                                  --Pope.

   2. To be, or come, in the way of; to hinder from passing; to
      stop; to impede; to retard; as, the bar in the harbor
      obstructs the passage of ships; clouds obstruct the light
      of the sun; unwise rules obstruct legislation. ``Th'
      impatience of obstructed love.'' --Johnson.

   Syn: To bar; barricade; stop; arrest; check; interrupt; clog;
        choke; impede; retard; embarrass; oppose.