Noun
Edwards syndrome (uncountable)
English Wikipedia has an article on:Edwards syndromeWikipedia
A genetic disorder caused by the presence of all or part of an extra 18th chromosome, and characterised by organ defects and developmental delays.
Synonym: trisomy 18
Besides Down syndrome (trisomy 21), some other human trisomies are extra Y or X chromosomes, and Edwards syndrome (trisomy 18) and Patau syndrome (trisomy 13), both of which have extremely high newborn fatality rates. Source: Internet