Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the amount of energy transferred by nuclear or ionizing radiation to a unit mass of absorbing material
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
The quantity of radiation energy, expressed in rads, that is administered or absorbed per unit mass of target.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.