adrenalin
/ə'drenəlin/
Definition
- Noun:
- A hormone and neurotransmitter: Adrenalin is a substance produced by the adrenal glands, especially in response to stress, fear, or excitement. It prepares the body for rapid action by increasing heart rate, blood pressure, and energy supplies.
- A specific drug: Adrenalin is also the trade name for a synthetic form of this hormone, used as a medication in emergencies, such as severe allergic reactions.
Examples of Usage
- Noun:
- The sudden scare caused a rush of adrenalin. (The sudden scare caused the body to release this hormone.)
- The doctor administered an injection of Adrenalin to treat the anaphylactic shock. (The doctor used the specific drug for emergency treatment.)
Advanced Usage
- "Adrenalin rush" or "adrenaline rush": A sudden, intense feeling of excitement and energy caused by the release of this hormone.
- Skydiving gives me an incredible adrenalin rush.
- "Adrenalin junkie" (informal): A person who seeks out dangerous or thrilling activities for the excitement they provide.
- He's a real adrenalin junkie, always looking for the next extreme sport.
Variants and Related Words
- Adrenaline: This is the more common, non-trademark spelling used in general contexts, especially in British English. The meanings are identical to "adrenalin".
- The news sent her adrenaline levels soaring.
- Adrenergic (adj): Relating to or denoting nerve cells that use adrenalin (or noradrenaline) as a neurotransmitter.
- Adrenergic receptors respond to stress hormones.
Synonyms
- Epinephrine: This is the official scientific and medical name for the same hormone and drug. "Adrenalin/Adrenaline" and "epinephrine" are used interchangeably, with "epinephrine" being more common in American medical contexts.
- The EpiPen auto-injector contains epinephrine.
Notes on Meaning
- The word primarily refers to a natural biochemical substance produced by the body.
- With a capital 'A' (Adrenalin), it specifically refers to the trademarked drug product.
- The feelings of excitement, heightened awareness, and increased strength in stressful situations are commonly attributed to the effects of this hormone.
Noun
-
a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action
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