radio opaque
/ˌreɪdioʊoʊˈpeɪk/
adjective
- Not allowing X-rays or other forms of radiation to pass through; appearing white or light on an X-ray image.
- Doctors injected a radio-opaque dye into the patient's veins to see the blood flow clearly.
- The dentist used a radio-opaque filling material to check for cavities.
- Metal implants are radio-opaque, so they show up brightly on X-ray scans.
Antonyms