roentgen

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
noun German physicist who discovered x-rays and developed roentgenography (1845-1923)

It was the greatest and most beneficial discovery of the nineteenth century, they said, and Professor Roentgen's thoughtful brow was laureled with a fame that made him greater than a king. — Dainty's Cruel Rivals; Or, The Fatal Birthday, Alex. McVeigh, Mrs. Miller
The former are produced by the high tension electric apparatus, which we have described in the chapter relating to wireless telegraphy; and the latter, called also the Roentgen rays, are generated by the Crookes' Tube. — Electricity for Boys, James Slough Zerbe

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