General:
* Ultrasonic: Relating to sound waves with frequencies beyond the range of human hearing.
* Ultraviolet: Relating to electromagnetic radiation with wavelengths shorter than visible light.
* Ultramodern: Extremely modern or up-to-date.
* Ultra-high: Extremely high.
* Ultra-low: Extremely low.
Specific:
* Ultramarathon: A running race longer than the standard marathon distance.
* Ultranationalism: Extreme nationalism.
* Ultrasound: A technique using sound waves to create images of organs and other internal structures.
* Ultraviolet light: Light that can cause sunburn and damage to the skin.
* Ultra-processed food: Foods that have been heavily processed and contain many additives.
* Ultra-thin: Extremely thin.
* Ultra-rich: Extremely wealthy.
* Ultra-sensitive: Extremely sensitive.
* Ultra-realistic: Extremely realistic.
Less Common:
* Ultranationalist: A person who believes in extreme nationalism.
* Ultraviolet astronomy: The study of celestial objects using ultraviolet light.
* Ultrasound imaging: The use of ultrasound to create images of the body.
* Ultrasonic cleaning: A method of cleaning using ultrasonic vibrations.
* Ultraviolet disinfection: The use of ultraviolet light to kill bacteria and viruses.
This is just a small sample of the many words that use the prefix "ultra." The prefix often indicates something that is extreme, beyond the ordinary, or very advanced.