The Collaborative International Dictionary of English v.0.48:

Lee \Lee\, n.; pl. Lees (l[=e]z). [F. lie, perh. fr. L. levare
   to lift up, raise. Cf. Lever.]
   That which settles at the bottom, as of a cask of liquor
   (esp. wine); sediment; dregs; -- used now only in the plural.
   [Lees occurs also as a form of the singular.] "The lees of
   wine." --Holland.
   [1913 Webster]

         A thousand demons lurk within the lee.   --Young.
   [1913 Webster]

         The wine of life is drawn, and the mere lees
         Is left this vault to brag of.           --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lees \Lees\ (l[=e]z), n. pl.
   Dregs. See 2d Lee.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Lees \Lees\ (l[=e]s), n.
   A leash. [Obs.] --Chaucer.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lees
    n 1: the sediment from fermentation of an alcoholic beverage

Moby Thesaurus II by Grady Ward, 1.0:

67 Moby Thesaurus words for "lees":
   alluvion, alluvium, ash, bones, chaff, cinder, clinker, culm,
   deadwood, deposition, deposits, diluvium, dishwater, draff, dregs,
   dross, dust, ember, feces, filings, froth, garbage, gash, grounds,
   hogwash, husks, leavings, loess, moraine, offal, offscourings,
   offscum, orts, parings, potsherds, precipitate, precipitation,
   rags, raspings, refuse, scoria, scourings, scrap iron, scraps,
   scum, sediment, settlings, shards, shavings, silt, sinter, slack,
   slag, slop, slops, smut, soot, stubble, sublimate, sweepings,
   swill, tares, wastage, waste, waste matter, wastepaper, weeds



Easton's 1897 Bible Dictionary:

Lees
   (Heb. shemarim), from a word meaning to keep or preserve. It was
   applied to "lees" from the custom of allowing wine to stand on
   the lees that it might thereby be better preserved (Isa. 25:6).
   "Men settled on their lees" (Zeph. 1:12) are men "hardened or
   crusted." The image is derived from the crust formed at the
   bottom of wines long left undisturbed (Jer. 48:11). The effect
   of wealthy undisturbed ease on the ungodly is hardening. They
   become stupidly secure (comp. Ps. 55:19; Amos 6:1). To drink the
   lees (Ps. 75:8) denotes severe suffering.