manipulandum

noun
ma·​nip·​u·​lan·​dum | \məˌnipyəˈlandəm\
plural manipulanda\ -​də \

Definition of manipulandum 

psychology

: something that is or is to be manipulated the instigator and manipulandum of behavior, the matrix within which all action must be described— R. R. Sears

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History and Etymology for manipulandum

New Latin, from English manipulate + Latin -andum (neuter of -andus, 1st conjunction gerundive ending)

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