WordNet (r) 3.0 (2006):

dregs
    n 1: sediment that has settled at the bottom of a liquid [syn:
         dregs, settlings]

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "dregs":
   alluvion, alluvium, ash, bones, canaille, cattle, chaff,
   children of darkness, cinder, clinker, culm, deadwood, deposit,
   deposition, deposits, diluvium, dishwater, draff, dregs of society,
   dross, dust, ember, feces, filings, froth, garbage, gash, grounds,
   hogwash, husks, leavings, lees, limbs of Satan, loess, losers,
   masses, mob, moraine, offal, offscourings, offscum, orts, outcasts,
   pariahs, parings, potsherds, precipitate, precipitation,
   proletariat, rabble, raff, rags, ragtag and bobtail, raspings,
   refuse, remains, residue, riffraff, rubbish, scoria, scourings,
   scrap iron, scraps, scum, sediment, settlings, shards, shavings,
   silt, sinter, slack, slag, slop, slops, smut, sons of Belial,
   sons of men, soot, sordes, stubble, sublimate, sweepings, swill,
   swinish multitude, tares, the bad, the evil, the reprobate,
   the unrighteous, the wicked, trash, unwashed, vermin, wastage,
   waste, waste matter, wastepaper, weeds



Easton's 1897 Bible Dictionary:

Dregs
   (Ps. 75:8; Isa. 51:17, 22), the lees of wine which settle at the
   bottom of the vessel.