NOUN (3)

1. a long monotonous harangue;

2. a long piece of writing;

3. an accurately levelled strip of material placed on a wall or floor as guide for the even application of plaster or concrete;

The Collaborative International Dictionary of English v.0.48:

Screed \Screed\ (skr[=e]d), n. [Prov. E., a shred, the border of
   a cap. See Shred.]
   1. (Arch.)
      (a) A strip of plaster of the thickness proposed for the
          coat, applied to the wall at intervals of four or five
          feet, as a guide.
      (b) A wooden straightedge used to lay across the plaster
          screed, as a limit for the thickness of the coat.
          [1913 Webster]

   2. A fragment; a portion; a shred. [Scot.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Screed \Screed\, n. [See 1st Screed. For sense 2 cf. also
   Gael. sgread an outcry.]
   1. A breach or rent; a breaking forth into a loud, shrill
      sound; as, martial screeds.
      [1913 Webster]

   2. An harangue; a long tirade on any subject.
      [1913 Webster]

            The old carl gae them a screed of doctrine; ye might
            have heard him a mile down the wind.  --Sir W.
                                                  Scott.
      [1913 Webster]

WordNet (r) 3.0 (2006):

screed
    n 1: a long monotonous harangue
    2: a long piece of writing
    3: an accurately levelled strip of material placed on a wall or
       floor as guide for the even application of plaster or
       concrete