The Collaborative International Dictionary of English v.0.48:

Excrement \Ex"cre*ment\, n. [L. excrementum, fr. excernere,
   excretum, to skin out, discharge: cf. F. excr['e]ment. See
   Excrete.]
   Matter excreted and ejected; that which is excreted or cast
   out of the animal body by any of the natural emunctories;
   especially, alvine, discharges; dung; ordure.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Excrement \Ex"cre*ment\, n. [L. excrementum, fr. excrescere,
   excretum, to grow out. See Excrescence.]
   An excrescence or appendage; an outgrowth. [Obs.] "Ornamental
   excrements." --Fuller.
   [1913 Webster]

         Living creatures put forth (after their period of
         growth) nothing that is young but hair and nails, which
         are excrements and no parts.             --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

excrement
    n 1: waste matter (as urine or sweat but especially feces)
         discharged from the body [syn: body waste, excretion,
         excreta, excrement, excretory product]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "excrement":
   carrion, corruption, dandruff, decay, dejecta, dejection,
   dejecture, discharge, effluent, egesta, ejecta, ejectamenta,
   ejection, excreta, excretes, extravasate, extravasation, exudate,
   exudation, filth, foul matter, furfur, gangrene, mess, muck, mucus,
   obscenity, ordure, pus, putrid matter, rot, scurf, scuz, slime,
   smut, snot, sordes, transudate, transudation, waste,
   waste matter