A substance added in small amounts to something else to improve, strengthen, or otherwise alter it.
Marked by, produced by, or involving addition.
Of or being any of certain primary colors of wavelengths that may be mixed with one another to produce other colors. See Table at color.
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.