The Collaborative International Dictionary of English v.0.48:

Traditionalist \Tra*di"tion*al*ist\, n.
   An advocate of, or believer in, traditionalism; a
   traditionist.
   [1913 Webster]

WordNet (r) 3.0 (2006):

traditionalist
    adj 1: stubbornly conservative and narrow-minded [syn:
           hidebound, traditionalist]
    n 1: one who adheres to traditional views [syn:
         traditionalist, diehard]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "traditionalist":
   Methuselah, antediluvian, antique, back number, conservative, dad,
   dodo, elder, fogy, fossil, fud, fuddy-duddy, granny, has-been,
   longhair, matriarch, mid-Victorian, mossback, old believer,
   old crock, old dodo, old fogy, old liner, old man, old poop,
   old woman, old-timer, patriarch, pop, pops, precisian,
   precisionist, reactionary, regular old fogy, relic, square,
   starets