NOUN (1)

1. a follower of the theories or an admirer of the music of Richard Wagner;


ADJECTIVE (1)

1. of or relating to Richard Wagner or his music;

The Collaborative International Dictionary of English v.0.48:

Wagnerian \Wag*ne"ri*an\, a.
   Of, pertaining to, or resembling the style of, Richard
   Wagner, the German musical composer.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Wagnerian
    adj 1: of or relating to Richard Wagner or his music
    n 1: a follower of the theories or an admirer of the music of
         Richard Wagner