One of the mysteries of the English language finally explained.
Attributive and in the genitive. Designating a severe form of histiocytosis occurring mainly in infants and young children in which many organs of the body are affected by the proliferation of Langerhans cells.
1930s. From the names of Erich Letterer, German pathologist, and Sture August Siwe, Swedish paediatrician, who described the disorder independently in 1924 and 1933, respectively.
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