Medical Definition of overexpression
: excessive expression of a gene (as that caused by increasing the frequency of transcription We now suspect that many, if not most, cancers arise through the overexpression … of key cellular regulatory genes—J. D. Watson et al
overexpress\-rik-ˈspres\play transitive verb
Seen and Heard
What made you want to look up overexpression? Please tell us where you read or heard it (including the quote, if possible).