manipulandum
noun
ma·nip·u·lan·dum
məˌnipyəˈlandəm
plural manipulanda
-də
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
R. R. Sears
Word History
Etymology
New Latin, from English manipulate + Latin -andum (neuter of -andus, 1st conjunction gerundive ending)