| 单词 | X-ray |
| 释义 | Word Frequency X-ray or x-ray noun 1. a. electromagnetic radiation emitted when matter is bombarded with fast electrons. X-rays have wavelengths shorter than that of ultraviolet radiation, that is less than about 1 × 10–8 metres. They extend to indefinitely short wavelengths, but below about 1 × 10–11 metres they are often called gamma radiation b. (as modifier) X-ray astronomy 2. a picture produced by exposing photographic film to X-rays: used in medicine as a diagnostic aid as parts of the body, such as bones, absorb X-rays and so appear as opaque areas on the picture 3. (usually capital) communications a code word for the letter x verb (transitive) 4. to photograph (part of the body, etc) using X-rays 5. to treat or examine by means of X-rays Word origin C19: partial translation of German X-Strahlen (from Strahl ray), coined by W. K. Roentgen in 1895 |
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