Effector

Effector ( Efficere of latin, cause ') stands for:

Effector ( physiology ), a successful cell in a target organ (eg, a muscle fiber in a muscle)
Effector (genetics ), a molecule that alters the binding ability of the regulatory protein to the DNA
Cause Effector (biology), generally molecules that protein conversions
Effector (robotics)
Reactor in the art generally an element which converts an input variable in a different type of output, to produce a desired action or effect