The quality or state of being composed of cells, or the degree to which something has a cellular structure.
From cellular + -ity (suffix forming nouns of state or quality). Cellular derives from Latin cellula (small room), so cellularity literally means 'the quality of having small rooms.'
Cellularity is why doctors can tell if a tumor is cancerous by looking at a sample—the more chaotic the cellularity (disorganized cell packing), the more dangerous the cancer, making this property a crucial checkpoint in diagnosis.
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