factor XIII
noun
\ -ˌthər(t)-ˈtēn, -ˈthər(t)-
\
\
Medical Definition of factor XIII
: a clotting factor that is catalyzed by thrombin during the final stage of clot formation to an active form which cross-links strands of fibrin resulting in a stable, insoluble clot
— called also fibrinase
— see transglutaminase