Bioforming
Bioforming was a process that involved the transformation of an individual's physiology at a ular level. Once bioformed, an individual could live in environments that would otherwise be deadly to their species. However, in certain cases the transformation was such extreme that the bioformed individual could no longer tolerate their original natural environment. In this sense, it was the opposite of terraforming. ()

In the 2250s, the Illyrians were known to use genetic engineering to adapt their bodies to new planets, rather than expend enormous resources to terraform them. ()

In 2269, Captain James T. Kirk and Commander Spock experienced a type of bioforming on , rendering them unable to breathe out of water. ()

In 2374, The Doctor diagnosed  Tom Paris and Ensign Harry Kim as having been bioformed on a class Y planet in the Vaskan sector of the Delta Quadrant, which left them unable to survive in class M environments. It was later discovered that they were in fact duplicates of the real Paris and Kim, formed out of the Silver Blood indigenous to the planet. ()

nl:Biovorming
Academic disciplines
Physiology