Ha·shi·mo·to's disease 
(hä′shē-mōtōz′)
(hä′shē-mōtōz′)n.
An autoimmune disease of the thyroid gland, characterized by goiter, infiltration of the thyroid gland with lymphocytes, and hypothyroidism. Also called Hashimoto's thyroiditis.
[After Hakaru Hashimoto (1881-1934), Japanese physician.]