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From Biology-Online Dictionary
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Expand and contract rhythmically; beat rhythmically; The baby's heart was pulsating again after the surgeon massaged it.Produce or modulate (as electromagnetic waves) in the form of short bursts or pulses or cause an apparatus to produce pulses; pulse waves; a transmitter pulsed by an electronic tube.pulsate

To throb, as a pulse; to beat, as the heart. The heart of a viper or frog will continue to pulsate long after it is taken from the body. (E. Darwin)

Origin: L. Pulsatus, p. P. Of pulsare to beat, strike, v. Intens. Fr. Pellere to beat, strike, drive. See Pulse a beating, and cf. Pulse.