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From our dictionary:
Par•nas•si•an

(pär•nas'Eun),
adj.
1. pertaining to Mount Parnassus.
2. pertaining to poetry.
3. of, pertaining to, or noting a school of French poets of the latter half of the 19th century, characterized chiefly by a belief in art for art's sake, by an emphasis on metrical form, and by the repression of emotive elements: so called from Le Parnasse Contemporain, the title of their first collection of poems, published in 1866.

n.
a member of the Parnassian school of French poets.