pulsing
     adj : expanding and contracting rhythmically as to the beating of
           the heart; "felt the pulsating artery"; "oh my beating
           heart" [syn: {beating}, {pulsating}]
     n : (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},
          {pulse}, {impulse}]
Source: WordNet® 2.0