Definition of adrenaline noun from the Oxford Advanced American Dictionary

 

adrenaline

 noun
noun
NAmE//əˈdrɛnl̩ən//
 
(also adrenalin)[uncountable]
 
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a substance produced in the body when you are excited, afraid, or angry. It makes the heart beat faster and increases your energy and ability to move quickly The excitement at the start of a race can really get the adrenaline flowing. a rush/surge of adrenaline A shot of adrenaline was given as an antidote to the wasp sting.
See the Oxford Advanced Learner's Dictionary entry: adrenaline