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The Collaborative International Dictionary of English v.0.48:

Adrenaline \Ad*re"nal*ine\, n. Also Adrenalin \Ad*re"nal*in\ (Physiol. Chem.) 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. --MI11 Syn: epinephrine; 3,4-dihydroxy-1-[1-hydroxy-2-(methylamino)-ethyl]benzene. [Webster 1913 Suppl. +PJC]