Down's

noun

ˈdau̇nz 

variants or less commonly Down

ˈdau̇n 

often attributive

: down syndrome

a Down's patient

Word History

First Known Use

1967, in the meaning defined above

Medical Definition

Down's

noun

ˈdau̇nz 

variants or Down

ˈdau̇n 

: down syndrome

—usually used before another noun

… the chance that a woman of 30 years will have a Down baby are one in 1,000.

—Paul Donohue, The Sun-Sentinel (Fort Lauderdale, Florida)