Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Sports One who sets the pace in a race.
  • noun A leader in a field.
  • noun A part of the body, such as the mass of muscle fibers of the sinoatrial node, that sets the pace or rhythm of physiological activity.
  • noun Any of several usually miniaturized and surgically implanted electronic devices used to stimulate or regulate contractions of the heart muscle.
  • noun Biochemistry A substance that regulates a series of related reactions.

from The Century Dictionary.

  • noun One who sets the pace for others, as in racing.
  • noun One who or that which makes a record for speed.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Physiol. & Anat.) a specialized bit of heart tissue that controls the heartbeat.
  • noun An implanted electronic device that takes over the function of the natural cardiac pacemaker{1}; -- used to assist people whose heartbeat is irregular.
  • noun A horse used to set the pace in racing.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun One who sets the pace in a race, to guide the others.
  • noun anatomy A set of nerves which stimulate the heart to beat.
  • noun hence, medicine A medical implement that is used to stimulate a heart to beat by simulating the action of the natural pacemaker.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun an implanted electronic device that takes over the function of the natural cardiac pacemaker
  • noun a specialized bit of heart tissue that controls the heartbeat
  • noun a horse used to set the pace in racing
  • noun a leading instance in its field

Etymologies

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Examples

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