rhizoverbBeta
DictionarypacemakerHeartbeat-regulating device
noun

pacemaker

The heart tissue that initiates each heartbeat with electrical signals.

The heart's natural pacemaker sends electrical signals that start each heartbeat.

Etymology
paceEnglishrate or rhythm
+makEnglishestablish
+erEnglishperson or thing performing

Pacemaker joins pace with maker. Applied to heart tissue, it names the source of electrical impulses that establish the rhythm followed by the rest of the heart.

More examples

  • The sinoatrial node normally serves as the heart's pacemaker.
  • Exercise causes the heart's natural pacemaker to send signals faster.
  • If the main pacemaker fails, other heart cells can take over.

Forms

pacemaker · pacemakers

Similar words

sinoatrial node
Specifically names the normal pacemaker in the right atrium.