The Collaborative International Dictionary of English v.0.48:

Miser \Mi"ser\ (m[imac]"z[~e]r), n. [L. miser wretched,
   miserable; cf. Gr. mi^sos hate, misei^n to hate: cf. It. &
   Sp. misero wretched, avaricious.]
   [1913 Webster]
   1. A wretched person; a person afflicted by any great
      misfortune. [Obs.] --Spenser.
      [1913 Webster]

            The woeful words of a miser now despairing. --Sir P.
                                                  Sidney.
      [1913 Webster]

   2. A despicable person; a wretch. [Obs.] --Shak.
      [1913 Webster]

   3. A covetous, grasping, mean person; esp., one having
      wealth, who lives miserably for the sake of saving and
      increasing his hoard.
      [1913 Webster]

            As some lone miser, visiting his store,
            Bends at his treasure, counts, recounts it o'er.
                                                  --Goldsmith.
      [1913 Webster]

   4. A stingy person; one very reluctant to spend money.
      [PJC]

   5. A kind of large earth auger. --Knight.
      [1913 Webster]

WordNet (r) 3.0 (2006):

miser
    n 1: a stingy hoarder of money and possessions (often living
         miserably)

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "miser":
   Silas Marner, accumulator, bill collector, cheapskate, churl,
   collection agent, collector, connoisseur, curmudgeon, douanier,
   dunner, exciseman, farmer, gatherer, glutton, hog, magpie,
   muckworm, niggard, pack rat, penny pincher, pig, piker, pinchfist,
   pinchgut, pinchpenny, save-all, scrooge, skin, skinflint, stiff,
   tax collector, tightwad