a product of living cells that usu circulates in body liquids, e.g. the blood or sap, and produces a specific effect on the activity of cells remote from its point of origin: compare chalone
a synthetic substance that imitates the action of a natural hormone
hormonal /hawʹmohnl/ adj
hormonally /hawʹmoh-/ adv
[Greek hormōn, present part. of horman to stir up, from hormē impulse, assault]