We found 32 dictionaries that define the word X-rays:

General (8 matching dictionaries)

1. X-rays, x-rays: Merriam-Webster
2. x-rays, x-rays: Collins English Dictionary
3. X-rays, x-rays: Vocabulary.com
4. X-Rays, X-rays, x-rays: Wordnik
5. X-rays, x-rays: Wiktionary
6. X-rays: Dictionary.com
7. The X-Rays, X-Rays, X-rays: Wikipedia, the Free Encyclopedia
8. X-rays: TheFreeDictionary.com

Art (1 matching dictionary)

9. X-rays: A Cross Reference of Latin and Greek Elements

Computing (1 matching dictionary)

10. x-rays: Encyclopedia

Medicine (9 matching dictionaries)

11. X-rays: Merriam-Webster Medical Dictionary
12. Dorland's Illustrated Medical Dictionary (No longer online)
13. Medical Dictionary (No longer online)
14. X-rays: Merck Manuals
15. GASTROLAB Digestive Dictionary (No longer online)
16. Medical Device Glossary of Terms (No longer online)
17. X-rays: Breast Cancer Glossary of Medical Terms
18. X-Rays: Medical Dictionary Online
19. x-rays: Medical dictionary

Science (7 matching dictionaries)

20. From Stargazers to Starships Glossary (No longer online)
21. Mars Glossary (No longer online)
22. X-Rays: Extragalactic Astronomy
23. X-rays: NRC Glossary of Nuclear Terms --
24. Accelerator Glossary (No longer online)
25. Weather Glossary (No longer online)
26. X-RAYS: Zoom Astronomy Glossary

Tech (6 matching dictionaries)

27. X-rays: Webster's New World Telecom Dictionary
28. Metal Terminology (No longer online)
29. AUTOMOTIVE TERMS (No longer online)
30. Farrier & Hoofcare (No longer online)
31. National Weather Service Glossary (No longer online)
32. PhotoNotes Dictionary of Film and Digital Photography (No longer online)

(Note: See x-ray as well.)

Definitions from WordNet (x-ray) ▸ verb:  examine by taking x-rays ▸ verb:  take an x-ray of something or somebody ("The doctor x-rayed my chest") ▸ Also see x-ray Phrases: characteristic x-rays, diagnostic x-rays, soft x-rays, hard x-rays, Megavoltage X-rays, more... ▸ Words similar to X-rays ▸ Usage examples for X-rays ▸ Idioms related to X-rays ▸ Wikipedia articles (New!) ▸ Words that often appear near X-rays ▸ Rhymes of X-rays ▸ Invented words related to X-rays