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(genetic biology)

Grammar: noun
Definition: a hormone released by the adrenal glands. Another name for this hormone is epinephrine.
Example:
1. Adrenaline plays a large role in the "fight or flight" reaction.

2. Adrenaline is secreted by the adrenal medulla during periods of stress.
Alternative Form: epinephrine, adrenalin
Usage Note: Adrenalin (uppercase) was registered as a trademark in the USA, and its generic use (lowercase) is mainly British.