Origin: Greek prefix auto-
Autoimmune has 2 different meanings across 1 category:
of or relating to the immune response of the body against substance normally present in the body
"The patient's fatigue was caused by an autoimmune reaction where her white blood cells mistakenly attacked her own thyroid gland."
Of or pertaining to autoimmunity.
"The doctor explained that her autoimmune condition was attacking her own healthy cells, which required immediate treatment."