radiolucent

/ˌreɪdioʊˈluːsənt/
adjective
  1. Allowing X-rays or other radiation to pass through easily, appearing dark on an X-ray image.
    • The doctor pointed out the radiolucent area in the bone, which might indicate a cyst.
    • Because fat is more radiolucent than muscle, it shows up differently on the scan.
    • Air is radiolucent, so the lungs appear dark on a chest X-ray.
Synonyms