X-ray

Definitions

1. Short wavelength electromagnetic radiation usually produced by bombarding a metal target in a vacuum. Used to create images of the internal structure of objects; this is possible because X-rays pass through most objects and can expose photographic film.
2. Alternative letter-case form of X-ray.
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3. A radiograph: a photograph made with X-rays.
4. An X-ray machine.
5. A tactical motif where a piece exerts influence or control over a square, piece, or line indirectly through another intervening piece.

Equivalents

Examples

“X-rays are light⟳ with a wavelength between 0.1 and 10 nm.”

“The doctor ordered some X-rays of my injured wrist.”

“And this friendly was not without its injury worries, with defender Gary Cahill substituted early on after a nasty, needless push⟳ by Dries Mertens that caused him to collide with goalkeeper Joe Hart, an incident that left the Chelsea defender requiring a precautionary X-ray at Wembley.”

“… analogous to x-ray image formation …”

CEFR level