WordNet (r) 3.0 (2006):

pulsing
    n 1: (electronics) a sharp transient wave in the normal
         electrical state (or a series of such transients); "the
         pulsations seemed to be coming from a star" [syn:
         pulsation, pulsing, pulse, impulse]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "pulsing":
   alternate, beating, cadenced, cadent, circling, cyclic, epochal,
   even, every other, full, in numbers, in rhythm, intermittent,
   isochronal, measured, mellow, metric, metronomic, oscillatory,
   palpitant, periodical, pitapat, plangent, pulsatile, pulsating,
   pulsative, pulsatory, reciprocal, recurrent, recurring, resonant,
   resonating, rhythmic, rich, rolling, rotary, seasonal, serial,
   sonorous, staccato, steady, throbbing, undulant, undulatory,
   vibrant, vibrating, wavelike, wheeling