Adjacent Words

roentgen definitions

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WordNet (r) 3.0 (2005)

n
1: a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air [syn: roentgen, R]
2: German physicist who discovered x-rays and developed roentgenography (1845-1923) [syn: Roentgen, Wilhelm Konrad Roentgen, Rontgen, Wilhelm Konrad Rontgen]

Merriam Webster's

biographical name — see rontgen

Merriam Webster's

I. adjective Etymology: International Scientific Vocabulary, from Wilhelm Röntgen Date: 1896 of or relating to X-rays <roentgen examinations> II. noun Date: 1922 the international unit of x-radiation or gamma radiation equal to the amount of radiation that produces in one cubic centimeter of dry air at 0°C and standard atmospheric pressure ionization of either sign equal to one electrostatic unit of charge

U.S. Military Dictionary

(*) A unit of exposure dose of gamma (or X-) radiation. In field dosimetry, one roentgen is essentially equal to one rad.

Oxford Reference Dictionary

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. Röntgen, Ger. physicist d. 1923, discoverer of X-rays