The Collaborative International Dictionary of English v.0.48:

Pulsate \Pul"sate\, v. i. [imp. & p. p. Pulsated; p. pr. & vb.
   n. Pulsating.] [L. pulsatus, p. p. of pulsare to beat,
   strike, v. intens. fr. pellere to beat, strike, drive. See
   Pulse a beating, and cf. Pulse, v.]
   To throb, as a pulse; to beat, as the heart.
   [1913 Webster]

         The heart of a viper or frog will continue to pulsate
         long after it is taken from the body.    --E. Darwin.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pulsate
    v 1: expand and contract rhythmically; beat rhythmically; "The
         baby's heart was pulsating again after the surgeon massaged
         it" [syn: pulsate, throb, pulse]
    2: move with or as if with a regular alternating motion; "the
       city pulsated with music and excitement" [syn: pulsate,
       beat, quiver]
    3: 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" [syn: pulse, pulsate]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "pulsate":
   alternate, be here again, beat, beat a ruffle, beat a tattoo,
   circle, come again, come and go, come around, come round,
   come round again, come up again, cycle, drum, fluctuate, flutter,
   go pitapat, hammer, intermit, oscillate, palpitate, pant, patter,
   pitter-patter, pound, pulse, pump, quiver, reappear, recur,
   reoccur, repeat, return, reverberate, revolve, roar, roll,
   roll around, rotate, ruffle, sound a tattoo, splatter, splutter,
   sputter, throb, thrum, thud, thump, tick, ticktock, turn, undulate,
   vibrate, wheel, wheel around