| 单词 | roentgen |
| 释义 | roentgen n. a unit of ionizing radiation, the amount producing one electrostatic unit of positive or negative ionic charge in one cubic centimetre of air under standard conditions. Phrases and idioms roentgen rays X-rays. Etymology: W. C. R{ouml}ntgen, Ger. physicist d. 1923, discoverer of X-rays |
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