from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A unit of energy absorbed from ionizing radiation, equal to 100 ergs per gram or 0.01 joules per kilogram of irradiated material. It has been replaced as a standard scientific unit by the gray.
- adj. Slang Excellent; wonderful.
- abbr. radian
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Excellent, short for radical.
- n. A non-SI unit of absorbed dose of radiation, equal to 0.01 gray.
- n. Abbreviation of radian.
- n. Abbreviation of radiator.
from the GNU version of the Collaborative International Dictionary of English
- n. a unit of measurement of the amount of ionizing radiation absorbed by an object, equal to an energy of 100 ergs per gram of irradiated material (equal to 0.01 gray).
- imp. & p. p. of read, rede.
from The Century Dictionary and Cyclopedia
- Afraid; frightened.
- A Middle English form of rath.
- A Middle English preterit of ride.
- An obsolete preterit of read.
- n. A radical.
- n. In photometry, a proposed unit of quantity of light equal to the amount of energy in luminous form obtained in one second from a light-flux of one lumen. The rad is of a lumen-hour.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
- n. the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)
r(adiation) a(bsorbed) d(ose).
Short for radical.(American Heritage® Dictionary of the English Language, Fourth Edition)