(1) A catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action
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- Adrenaline: a catecholamine hormone secreted by the adrenal gland in response to stress (when it stimulates the autonomic nervous system).
- A neurotransmitter which is synthesized from norepinephrine.
Is used medicinally as a heart stimulant, vasoconstrictor and bronchial relaxant.