(krôs′rē-ăk′shən, krŏs′-)n. The reaction between an antigen and an antibody that was generated against a different but similar antigen.cross′-re·act′ v.cross′-re·ac′tive adj.cross′-re·ac·tiv′i·ty n.TranslationsEncyclopediaSeecross-reaction
cross-reactivity
cross-reactivity
[kros″re-ak-tiv´ĭ-te] the degree to which an antibody or antigen participates in cross-reactions.