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What is another word for pacemaker?

What's another word for pacemaker? | Here's a list of synonyms for pacemaker.

Definition 1: a horse used to set the pace in racing - [noun denoting animal]

Definition 1: an implanted electronic device that takes over the function of the natural cardiac pacemaker - [noun denoting artifact]

Definition 1: a specialized bit of heart tissue that controls the heartbeat - [noun denoting body]

Definition 1: a leading instance in its field - [noun denoting cognition]