trisomy 18

noun
\-ˈā(t)-ˈtēn \

Medical Definition of trisomy 18 

: a congenital condition that is characterized especially by mental retardation and by craniofacial, cardiac, gastrointestinal, and genitourinary abnormalities, is caused by trisomy of the human chromosome numbered 18, and is typically fatal especially within the first year of life

called also Edwards syndrome

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