Home›Browse›A›adrenalineadrenalineOur editors are putting together more complete content — check back in about 20 minutesadrenalineadrenaline — nounnoun1. a hormone that makes your heart beat faster and gives you energy when you are ex1.nounDefinitiona hormone that makes your heart beat faster and gives you energy when you are excited or frightenedExampleThe roller coaster ride gave me an adrenaline rush.