x-ray

Short definition from Wiktionary

Noun

1. 1
   Alternative letter-case form of X-ray.
2. 2
   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.
3. 3
   A radiograph: a photograph made with X-rays.
4. 4
   An X-ray machine.
5. 5
   A tactical motif where a piece exerts influence or control over a square, piece, or line indirectly through another intervening piece.

Verb

1. 1
   Alternative letter-case form of X-ray.
2. 2
   To take a radiograph of; to obtain an image of using X-ray radiation, especially for the purpose of medical diagnostic evaluation.
3. 3
   Of a piece, to exert indirect influence, by either attacking, defending, or controlling an opponent's or friendly piece through an intervening piece along a rank, file, or diagonal.

Adjective

1. 1
   Of or relating to X-rays.