A model prediction of a negative result, such as no biological activity, when the true result is positive, i.e. activity.
See also: confusion matrix
Source:
PAC, 2016, 88, 239. 'Glossary of terms used in computational drug design, part II (IUPAC Recommendations 2015)' on page 246 (https://doi.org/10.1515/pac-2012-1204)