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pacemaker

pace·mak·er

pacemaker

 
pronunciation:
peIs meI kr
part of speech: noun
definition 1: a small electronic device implanted under the skin to regulate the heart rate in patients with heart problems.
definition 2: one whose speed determines the speed of others; pacesetter.
definition 3: a trend setter; leader.
similar words:
bellwether
derivation: pacemaking (n.)