A small device, usually of rubber or plastic containing a protruding nipple-shaped portion which a baby may place in its mouth and suck on; it is used to keep babies contented.
... as usual, was the pacifier. He strode across the room, and the sharp sound of his heels on the creaking floor broke the tension. He said softly to Pierre: "You've raised hell enough. Now let's go up and get Jack down here to ... — Riders of the Silences • John Frederick