(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.
cross′-react′
v.i. (of an antigen or antibody) to participate in a cross-reaction. [1970–75]EncyclopediaSeecross-reaction