Adrenaline - Definitions from Dictionary.com

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

a·dren·a·line

Audio Help [uh-dren-l-in, -een] Pronunciation Key

–noun Biochemistry, Pharmacology.

epinephrine (def. 1).

[Origin: 1900–05; adrenal + -ine¹

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
Adrenaline

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American Heritage Dictionary - Cite This Source - Share This

a·dren·a·line Audio Help (ə-drěn'ə-lĭn) Pronunciation Key
n. See epinephrine.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

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ep·i·neph·rine also ep·i·neph·rin Audio Help (ěp'ə-něf'rĭn) Pronunciation Key
n.

A hormone secreted by the adrenal medulla that is released into the bloodstream in response to physical or mental stress, as from fear or injury. It initiates many bodily responses, including the stimulation of heart action and an increase in blood pressure, metabolic rate, and blood glucose concentration. Also called adrenaline.
A white to brownish crystalline compound, C₉H₁₃NO₃, isolated from the adrenal glands of certain mammals or synthesized and used in medicine as a heart stimulant, vasoconstrictor, and bronchial relaxant.

[epi- + nephr(o)- + -ine².]

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

WordNet - Cite This Source - Share This

adrenaline
noun
a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action [syn: epinephrine]

The American Heritage Science Dictionary - Cite This Source - Share This

adrenaline Audio Help (ə-drěn'ə-lĭn) Pronunciation Key
See epinephrine.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

American Heritage New Dictionary of Cultural Literacy, Third Edition - Cite This Source - Share This
adrenaline [(uh-dren-l-in)]

A hormone secreted by the adrenal glands that helps the body meet physical or emotional stress (see endocrine system).

Note: Adrenaline plays a very large role in the fight or flight reaction, which refers to the various processes that occur within the body when it is confronted with some form of mental or physical stress.

Note: Figuratively, the term adrenaline is used in speaking of a high state of excitement: “When the race began, the adrenaline really started pumping.”

[Chapter:] Medicine and Health

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

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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