- 1[usually plural] a type of radiation that can pass through objects that are not transparent and make it possible to see inside them an X-ray machine (= one that produces X-rays)
- 2a photograph made by X-rays, especially one showing bones or organs in the body a chest X-ray The doctor studied the X-rays of her lungs. to take an X-ray
- 3a medical examination using X-rays I had to go for an X-ray.
Check pronunciation: X-ray