Wordnet 3.0
NOUN (1)
1.
a musician who plays the viola;
The Collaborative International Dictionary of English v.0.48:
Violist \Vi"ol*ist\, n. [Cf. F. violiste.]
A player on the viol.
[1913 Webster]
WordNet (r) 3.0 (2006):
violist
n 1: a musician who plays the viola