cross-reacting antibody

https://doi.org/10.1351/goldbook.13056
Antibody that is able to react with an antigen that did not specifically stimulate its production.
Note: Cross-reactions are usually weaker than the reaction of the antibody with the antigen that caused its production.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1151 [Terms] [Paper]