manipulator

noun

ma·​nip·​u·​la·​tor -ˌlātə(r) 

-ātə-

plural -s

: one that manipulates: such as

a

: a mechanical device for handling objects as desired without touching them with the hands

b

: a person engaged in activities designed to influence by artificial means the prices of stocks or commodities

c

manipulators plural : the thumb and index finger whose combined action largely controls the blade in fencing

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