What it means
The beginning of words for something past a usual limit. ultrasoundUL-truh-sowndAn imaging test that uses high-frequency sound waves to make pictures of the inside of the body.ultra- beyond, more thansound sound wavesFull entry uses sound waves too high for the human ear to hear, ultraviolet light lies beyond violet at the end of visible light, and ultrafiltration pushes fluid out of the blood during dialysis.
Related terms
ultrasound
An imaging test that uses high-frequency sound waves to make pictures of the inside of the body.
hyper-
A word beginning that means above, over or more than normal.
super-
A word beginning that means above, beyond or more than normal.