Medical Definition of memory cell
: a long-lived lymphocyte that carries the antibody or receptor for a specific antigen after a first exposure to the antigen and that remains in a less than mature state until stimulated by a second exposure to the antigen at which time it mounts a more effective immune response than a cell which has not been exposed previously
Seen and Heard
What made you want to look up memory cell? Please tell us where you read or heard it (including the quote, if possible).