Kt/V. In medicine, Kt/V is a number used to quantify hemodialysis and peritoneal dialysis treatment adequacy. In the context of hemodialysis, Kt/V is a pseudo-dimensionless number; it is dependent on the pre- and post-dialysis concentration (see below). It is not the product of K and t divided by V, as would be the case in a true dimensionless number. In peritoneal dialysis, it isn't dimensionless at all.
recovery - the act of regaining or saving something lost (or in danger of becoming lost) retrieval human action, human activity, act, deed - something that people do or cause to happen
A typical recovery disk for a new Acer PC. A recovery disc is a general term for media containing a backup of the original factory condition or a favored condition of a computer as configured by an original equipment manufacturer or an end-user.