The Collaborative International Dictionary of English v.0.48:

Snob \Snob\, n. [Icel. sn[=a]pr a dolt, impostor, charlatan. Cf.
   Snub.]
   1. A vulgar person who affects to be better, richer, or more
      fashionable, than he really is; a vulgar upstart; one who
      apes his superiors. --Thackeray.
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            Essentially vulgar, a snob. -- a gilded snob, but
            none the less a snob.                 --R. G. White.
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   2. (Eng. Univ.) A townsman. [Canf]
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   3. A journeyman shoemaker. [Prov. Eng.] --Halliwell.
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   4. A workman who accepts lower than the usual wages, or who
      refuses to strike when his fellows do; a rat; a knobstick.
      [1913 Webster]

            Those who work for lower wages during a strike are
            called snobs, the men who stand out being "nobs"
                                                  --De Quincey.
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      [1913 Webster]

WordNet (r) 3.0 (2006):

snob
    n 1: a person regarded as arrogant and annoying [syn: snob,
         prig, snot, snoot]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "snob":
   Brahmin, bootlicker, cold-shoulder, cut, egghead, elitist,
   hanger-on, high-hat, highbrow, lickspittle, mandarin, name-dropper,
   ostracize, prig, snoot, snot, snub, sycophant, toady, tufthunter