Definition of "mosaicism" []

• A condition in which tissues of genetically different types occur in the same organism. (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.

• "Gonadal mosaicism is a rare event, but it does occur."
• "Here, a single-cell-level investigation of CNV in different human tissues led us to uncover the phenomenon of mitotically derived genomic mosaicism, which is stable in different cell types of one individual."
• "Then, when Casey's eye starts to turn blue, she discovers that she's suffering from genetic mosaicism, meaning she was going to be a twin but the other fetus didn't survive the full term."