caffeine
/'kæfi:in/
Definition
- Noun:
- A bitter alkaloid found in coffee and tea that is responsible for their stimulating effects: Caffeine is a natural chemical compound that acts as a stimulant to the central nervous system, commonly consumed in beverages like coffee, tea, and some sodas.
Usage Examples
- Noun:
- The coffee contains a high amount of caffeine.
- She avoids caffeine after 3 PM to help her sleep better at night.
- Caffeine can improve alertness and concentration for a short period.
Advanced Usage
- "Caffeine content": The amount of caffeine present in a food or beverage.
- Check the caffeine content on the energy drink label.
- "Caffeine-free": Describing a product that contains no caffeine.
- I drink caffeine-free herbal tea in the evening.
Variants and Related Words
- Caffeinated (adj): Containing caffeine.
- Most caffeinated drinks provide a temporary energy boost.
- Decaffeinated (adj/adj. used as noun: "decaf"): Having had most or all of the caffeine removed.
- He ordered a decaffeinated coffee.
Synonyms
- Stimulant: A substance that raises levels of physiological or nervous activity in the body.
- Theine: An older term for caffeine when found in tea.
Related Phrases
- "Caffeine kick" (informal idiom): The sudden increase in energy or alertness felt after consuming caffeine.
- I need my morning coffee for that caffeine kick to start the day.
- "Caffeine crash" (informal idiom): The feeling of fatigue that can follow after the stimulating effects of caffeine wear off.
- After the caffeine crash, he felt very tired.
Noun
-
a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects
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