a hormone secreted by the adrenal medulla that acts as a powerful stimulant in reponse to fear or stress; it stimulates autonomic nerve action. It can be obtained as a crystalline substance, C9H13NO3. It is used in medicine as a vasoconstrictor (hemostatic) and cardiac stimulant, also to reduce allergic reactions and to stimulate the heart in cases of cardiac arrest. [Webster 1913 Suppl.]
adrenalin, n. (also adrenaline)
1 a hormone secreted by the adrenal glands, affecting circulation and muscular action, and causing excitement and stimulation.
2 the same substance obtained from animals or by synthesis, used as a stimulant.
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