/mɔːˈsaɪzəm/ Maw-SAY-zuhm

Definitions

1. noun

The presence of cells with different genotypes within an individual organism, especially as a result of the fusion of two fertilized eggs or the failure of the cells in an early embryo to differentiate properly.

“The condition was diagnosed as a case of mosaicism, where the individual had a mix of normal and abnormal cells.”