epinephrine: a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action
hormone: the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect
enigma canon: a canon in which the entrances of successive parts were indicated by cryptic symbols and devices (popular in the 15th and 16th centuries)