What is "regenerations"

Usage examples of "regenerations".

Engin was old, even for a Time Lord, not only in the number of his regenerations but in the physical age of his present body.

Were they distorted memories of transplants, operations, cell regenerations, that were handed down for thousands of years in a terrifyingly garbled form?

His burns had not been as severe as Prynn’s, nor had they required grafts, but the dermal regenerations would take another day or two to complete.

His burns had not been as severe as Prynns, nor had they required grafts, but the dermal regenerations would take another day or two to complete.