A poisonous colorless crystalline compound, AgNO3, that becomes grayish black when exposed to light in the presence of organic matter and is used in manufacturing photographic film, silvering mirrors, dyeing hair, plating silver, and in medicine as a cautery and antiseptic.
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.