Lewis Short
mūtātor (noun M) : id.
* A changer; an exchanger, barterer (poet. and post-Aug. prose): mutator circulus anni, i. e. Zodiacus,Luc. 10, 202: mercis mutator Eoae, i. e. mercator,id. 8, 854: equorum, i. e. desultor,Val. Fl. 6, 161: mercium commerciorumque mutator,Arn. 3, 119.
Charlton T. Lewis, Charles Short, A Latin Dictionary