Designating a reaction to a plant pathogen in which there is necrosis of the cells surrounding the site of infection, isolating the pathogen and preventing its further spread. Now rare.
Origin
Mid 19th century (in an earlier sense). From necro- + -genous; in sense 1 after French nécrogène.
Definition of necrogenous in US English:
necrogenous
adjectivenɪˈkrɒdʒɪnəs
Botany
Designating a reaction to a plant pathogen in which there is necrosis of the cells surrounding the site of infection, isolating the pathogen and preventing its further spread. Now rare.
Origin
Mid 19th century (in an earlier sense). From necro- + -genous; in sense 1 after French nécrogène.