The Black Doctor closed his eyes wearily and flipped an activator switch.
They may have been, and the use of the activator may have been extorted from one of them.
Finally, he poked the activator bar, and watched as the machine spat out tape.
Nargyll wants to move your ship into one of the sheds, but the activator key's gone.
activator ac·ti·va·tor (āk'tə-vā'tər)
An agent that renders another substance active or accelerates a process or reaction.
The fragment produced by chemical cleavage of a proactivator that induces the enzymatic activity of another substance.