Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The amount of ionizing radiation required to produce the same biological effect as one rad of high-penetration x-rays.
  • noun A unit for measuring absorbed doses of radiation, equivalent to one roentgen of x-rays or gamma rays.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun Acronym rapid eye movement, a sleep state.
  • noun A dose of absorbed radiation equivalent to one roentgen of X-rays or gamma rays
  • noun computing A remark; a programming language statement used for documentation (in BASIC for example); also used in DOS batch files.
  • abbreviation knitting remaining

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[r(oentgen) e(quivalent in) m(an).]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Abbreviation of Roentgen equivalent in man.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Shortening.

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