Definition of "monoclonal" []

• Of, forming, or derived from a single clone: a monoclonal population of tumor cells. (adjective)
• A monoclonal product, especially a monoclonal antibody. (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.

• "RABER: A number of new drugs have come along that are what we call monoclonal antibodies."
• "Standard methods were available for selectively growing cells with functional HPRT enzymes and had already been used for several years for selection of mutants, hybridoma cells in monoclonal antibody production etc."
• "Dutch researchers conducted the study because there has been evidence that people can develop immune resistance to drugs known as monoclonal antibodies, which are derived from living cells."