Medical Dictionary
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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