The word "clonal" describes something that is derived from and genetically identical to a single organism. It refers to things that have been produced asexually and have identical genetic characteristics. Full definition
The presence of clonal expansions of such virus - specific cells may shrink the available repertoire for other antigens and contribute to the increased incidence of infectious disease in the elderly. (sens.org)
T and B cell clonal expansion in Ras associated lymphoproliferative disease (RALD) as revealed by next generation sequencing (invivoscribe.com)
Using spatial correlation functions to quantify the differences between emergent cell lineage segregation patterns, we find that strong adhesion often, but not always, maximizes the size of clonal cell clusters on flat surfaces. (journals.plos.org)