All 5 Uses

adrenaline
in
Kiss the Girls
(Auto-generated)

The adrenaline rush was gone now, but I felt an unnatural weariness.†
Chpt 1

adrenaline rush = the intense feeling that comes from an increase in the "fight or flight" hormone
Adrenaline surged powerfully through her body.†
Chpt 1 *

adrenaline = “fight or flight” stimulating hormone
Nothing could match this physical and emotional feeling: adrenaline pumping, heart beating loudly, total exhilaration in every part of his body.†
Chpt 2
Adrenaline was pumping through my body at a furious rate.†
Chpt 4
Little bullshit racism gets my adrenaline flowing, blood boiling.†
Chpt 4

Definitions:

(1) (adrenaline)
“fight or flight” stimulating hormone secreted by the adrenal gland in response to stress (making the body feel excited and ready for action)

Doctors are more likely to use the term epinephrine (possibly shortened to epi or EP). Adrenalin as a proper noun without the ending "e" is a trademark name for the same chemical.
(2) (meaning too rare to warrant focus)