The Collaborative International Dictionary of English v.0.48:

Fecal \Fe"cal\ (f[=e]"kal), a. [Cf. F. f['e]cal. See Feces.]
   Relating to, or containing, dregs, feces, or ordure;
   f[ae]cal.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fecal
    adj 1: of or relating to feces; "fecal matter" [syn: faecal,
           fecal]

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "fecal":
   bad, bad-smelling, barfy, crappy, disgusting, dungy, excremental,
   excrementary, feculent, fetid, filthy, flyblown, foul, frowsty,
   frowy, frowzy, fulsome, funky, fusty, gamy, gloppy, graveolent,
   gunky, high, icky, ill-smelling, maggoty, malodorous, mephitic,
   miasmal, miasmic, mildewed, mildewy, moldy, mucky, musty, nasty,
   nauseating, nidorous, noisome, noxious, odious, odorous, offensive,
   olid, ordurous, puky, putrid, rancid, rank, reasty, reasy, reechy,
   reeking, reeky, repulsive, rotten, scabby, scatologic,
   scatological, scummy, scurfy, shitty, slabby, slimy, sloppy,
   sloshy, sludgy, slushy, smellful, smelling, smelly, sposhy,
   stenchy, stercoraceous, stercoral, stinking, strong, stuffy,
   sulfurous, urinary, urinative, vile, vomity, wormy, yecchy