Definitions

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

  • n. The amount of ionizing radiation required to produce the same biological effect as one rad of high-penetration x-rays.
  • n. 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

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

Etymologies

r(oentgen) e(quivalent in) m(an).
(American Heritage® Dictionary of the English Language, Fourth Edition)
Abbreviation of Roentgen equivalent in man. (Wiktionary)
Shortening. (Wiktionary)

Examples

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