The Collaborative International Dictionary of English v.0.48:

highbrow \high"brow`\ n.
   a person of intellectual or erudite tastes; an intellectual.
   [WordNet 1.5] highbrow

The Collaborative International Dictionary of English v.0.48:

highbrow \highbrow\ highbrowed \highbrowed\adj.
   highly cultured or educated; pertaining to highly educated
   people; as, highbrow events such as the ballet or opera.
   [informal]
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

highbrow
    adj 1: highly cultured or educated; "highbrow events such as the
           ballet or opera"; "a highbrowed literary critic" [syn:
           highbrow, highbrowed]
    n 1: a person of intellectual or erudite tastes

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "highbrow":
   Brahmin, aesthete, aesthetic, bookish, brain, brainworker, brainy,
   cerebral, connoisseur, cultivated, cultured, deep, doubles,
   egghead, elitist, erudite, genius, highbrowed, intellect,
   intellectual, intellectualist, intellectualistic, learned,
   literate, mandarin, mastermind, name-dropper, prig, sage, savant,
   scholar, scholarly, snob, sophisticated, thinker, tufthunter,
   white-collar intellectual, wise man