[uh-dren-l-in, -een]
noun Biochemistry, Pharmacology.
epinephrine ( def 1 ).

1900–05; adrenal + -ine1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adrenaline or adrenalin (əˈdrɛnəlɪn)
US name: epinephrine a hormone that is secreted by the adrenal medulla in response to stress and increases heart rate, pulse rate, and blood pressure, and raises the blood levels of glucose and lipids. It is extracted from animals or synthesized for such medical uses as the treatment of asthma. Chemical name: aminohydroxyphenylpropionic acid; formula: C9H13NO3
adrenalin or adrenalin

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

also Adrenalin (trademark name), coined 1901 by Japanese chemist Jokichi Takamine (1853-1922), who discovered it, from Mod.L. adrenal "of or near the kidneys" (1875), from ad- "to" + renalis "of the kidneys," from L. renes "kidneys." Adrenaline rush was in use c.1970.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

adrenaline a·dren·a·line (ə-drěn'ə-lĭn)
See epinephrine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
adrenaline   (ə-drěn'ə-lĭn)  Pronunciation Key 
See epinephrine.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
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.”
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica


two separate but related hormones secreted by the medulla of the adrenal glands. They are also produced at the ends of sympathetic nerve fibres, where they serve as chemical mediators for conveying the nerve impulses to effector organs. Chemically, the two compounds differ only slightly; and they exert similar pharmacological actions, which resemble the effects of stimulation of the sympathetic nervous system. They are, therefore, classified as sympathomimetic agents. The active secretion of the adrenal medulla contains approximately 80 percent epinephrine and 20 percent norepinephrine; but this proportion is reversed in the sympathetic nerves, which contain predominantly norepinephrine.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Elements of space opera, Straubesque horror and adrenaline-laced action make
  this a demanding, rewarding read.
Sometimes the burst of adrenaline you get the night before the deadline is
  enough to propel you to a successful finish.
Human mind networks requires at least 3 kinds of neurotransmitters; adrenaline,
  serotonin and dopamine.
Not all gamers choose games based on how much adrenaline they muster, how
  elaborate the play is or how realistic the graphics are.
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