Etymology
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Down's Syndrome 

genetic disorder causing developmental and intellectual delays, 1961, from J.L.H. Down (1828-1896), English physician; chosen as a less racist name for the condition than earlier mongolism.

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Tay-Sachs 
fatal inherited disorder, 1907, named in German (1901) by German neurologist Henryk Higier (1866-1942) from names of British ophthalmologist Warren Tay (1843-1927) and U.S. physician and neurologist Warren Sachs (1858-1944) who had independently described it in 1881 and 1887 respectively.
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