Definition of "calcium oxide" []

• A white, caustic, lumpy powder, CaO, used as a refractory, as a flux, in manufacturing steel and paper, in glassmaking, in waste treatment, in insecticides, and as an industrial alkali. Also called lime3. (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.