Adrenaline

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Dictionary Meaning and Definition on 'Adrenaline'

Adrenaline Meaning and Definition from WordNet (r) 2.0
    adrenaline n : a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action [syn: epinephrine, epinephrin, Adrenalin]
Adrenaline Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Adrenaline \Ad*re"nal*ine\, n. Also Adrenalin \Ad*re"nal*in\ (Physiol. Chem.) A crystalline substance, C9H13O3N, obtained from suprarenal extract, of which it is regarded as the active principle. It is used in medicine as a stimulant and hemostatic.
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Wikipedia Meaning and Definition on 'Adrenaline'


Epinephrine (also known as adrenaline) is a hormone and neurotransmitter. Chemically, epinephrine is a catecholamine, a monoamine produced only by the adrenal glands from the amino acids phenylalanine and tyrosine.

The term adrenaline is derived from the Latin roots ad- and renes and literally means on the kidney, in reference to the adrenal gland's anatomic location on the kidney. The Greek roots epi- and nephros have similar meanings, and give rise to epinephrine. The term epinephrine is often shortened to epi in medical jargon.

Adrenal extracts containing adrenaline were first obtained by Polish physiologist Napoleon Cybulski in 1895. These extracts, which he called "nadnerczyna", contained epinephrine and other catecholamines.

As a hormone, epinephrine acts on nearly all body tissues. Its actions vary by tissue type and tissue expression of adrenergic receptors. For example, epinephrine causes smooth muscle relaxation in the airways, but causes contraction of the smooth muscle that lines most arterioles.

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