Operator
Pronunciation : Op"er*a`tor
Part of Speech : n.
Etymology : [L.]
Definition : 1. One who, or that which, operates or produces an effect.
2. (Surg.)
Defn: One who performs some act upon the human body by means of the hand, or with instruments.
3. A dealer in stocks or any commodity for speculative purposes; a speculator. [Brokers' Cant]
4. (Math.)
Defn: The symbol that expresses the operation to be performed; -- called also facient.
Source : Webster's Unabridged Dictionary, 1913