|Definition||A chromosomal disease that is characterized by flat-looking facial features and weak muscle tone (hypotonia) in infancy and is caused by trisomy of all or a critical portion of chromosome 21 and is associated with intellectual disability.
http://en.wikipedia.org/wiki/Down_syndrome, http://ghr.nlm.nih.gov/condition/down-syndrome, http://www.nichd.nih.gov/health/topics/down/Pages/default.aspx, http://www.omim.org/entry/190685?search=down%20syndrome&highlight=down%20syndromic%20syndrome
Complete trisomy 21 syndrome [EXACT]
Down's syndrome [EXACT]
Down's syndrome - trisomy 21 [EXACT]
Downs syndrome [EXACT]
G Trisomy [EXACT]
trisomy 21 syndrome [EXACT]