from The American Heritage® Dictionary of the English Language, 4th Edition

  • intransitive v. To expand and contract rhythmically; beat.
  • intransitive v. To quiver; vibrate.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To expand and contract rhythmically; to throb or to beat.
  • v. To quiver, vibrate, thrill.
  • v. To produce a recurring increase and decrease of some quantity.

from the GNU version of the Collaborative International Dictionary of English

  • intransitive v. To throb, as a pulse; to beat, as the heart.

from The Century Dictionary and Cyclopedia

  • To beat or throb, as the heart or a blood-vessel; contract and dilate in alternation or rhythmically, as the heart in systole and diastole, the disk of a jellyfish in swimming, the vacuoles in some protozoans, etc.

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

  • v. expand and contract rhythmically; beat rhythmically
  • v. produce or modulate (as electromagnetic waves) in the form of short bursts or pulses or cause an apparatus to produce pulses
  • v. move with or as if with a regular alternating motion


Latin pulsāre, pulsāt-, frequentative of pellere, to beat; see pel-5 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin pulsātiō ("repeated striking"), from pulsō ("strike repeatedly"), from pellō ("strike") (Wiktionary)


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