Wordnet 3.0
NOUN (1)
1.
a composer of symphonies;
The Collaborative International Dictionary of English v.0.48:
Symphonist \Sym"pho*nist\, n. [Cf. F. symphoniste.]
A composer of symphonies.
[1913 Webster]
WordNet (r) 3.0 (2006):
symphonist
n 1: a composer of symphonies