Definition of "roentgen" []

• A unit of radiation exposure equal to the quantity of ionizing radiation that will produce one electrostatic unit of electricity in one cubic centimeter of dry air at 0°C and standard atmospheric pressure. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "(they are, however, known as roentgen rays in many languages) but was rewarded in 1901 with the"
• "A glance told her the background radiation was almost a full roentgen."
• "They passed one that displayed eighty-one millionths of a roentgen per hour."