Medical Definition of false–negative
: relating to or being a test or an individual that is erroneously classified in a negative category (as of diagnosis) because of imperfect testing methods or procedures … any false-negative smears would again underestimate the prevalence of abnormal test results.—Jeanne Mandelblatt et al., The Journal of the American Medical Association, 18 July 1986—compare false-positive
Seen and Heard
What made you want to look up false–negative? Please tell us where you read or heard it (including the quote, if possible).