1. a hormone produced by the adrenal glands that increases heart rate, blood pressure, and energy in response to stress or excitement
Usage: medical/scientific
2. excitement, energy, or thrills experienced in dangerous or intense situations
Usage: informal

Examples

• The doctor injected adrenaline to treat the patient’s severe allergic reaction.
• Her adrenaline levels spiked during the emergency.
• The roller coaster gave me such an adrenaline rush.
• He was running on pure adrenaline after the accident.
• Extreme sports athletes are often adrenaline junkies.
• The adrenaline from the performance kept her awake for hours.
• When adrenaline kicks in, people can perform extraordinary feats of strength.