pulsate (v.) Look up pulsate at Dictionary.com
1741, back-formation from pulsation, from Latin pulsatus, past participle of pulsare "to beat against, strike upon," frequentative of pellere (past participle pulsus) "to beat, strike" (from PIE root *pel- (5) "to thrust, strike, drive"). Related: Pulsated; pulsating; pulsatile.