gliosis

noun

1. (countable, uncountable)A proliferation of astrocytes in damaged areas of the central nervous system. This proliferation usually leads to the formation of a glial scar.

   “Material for the second MS library (herein MS2) came from a pool of tissues from two patients, one with acute, active lesions and widespread inflammatory involvement in the white matter, and the other with chronic, "silent" lesions, with gliosis, but without evidence of a lymphocytic infiltrate.”