Down syndrome refers to the type of mental retardation caused by a chromosomal aberration (chromosome 21) and involving characteristic physical appearance. Down Syndrome is also known as Trisomy 21.
Other /More definition:
Down syndrome refers to a chromosomal abnormality in which there are three (3) 21st chromosomes rather than the normal two (2) . Children with Down syndrome typically function at the moderate level of mental retardation, have an increased likelihood of medical problems, and have unusual physical features. This syndrome is also called Trisomy 21.

Related Articles

Fragile-X syndrome at psychology-glossary.com■■■■■■■■■■
Fragile-X syndrome refers to a chromosomal abnormality in which one area on the X chromosome is pinched. . . . Read More
Dependent at psychology-glossary.com■■■■■
In psychology, the term dependent typically refers to a state or condition where an individual relies . . . Read More
Pica at psychology-glossary.com■■■■■
Pica refers to a form of eating disorder in which the infant or toddler persists in eating inedible, . . . Read More
Phalloplasty at psychology-glossary.com■■■■
Phalloplasty is defined as a transgender operation in which a penis is artificially constructed. Phalloplasty . . . Read More
Organic mental disorder at psychology-glossary.com■■■■
Organic mental disorder or OMD refers to a mental or emotional problem caused by brain diseases or injuries. . . . Read More
Linguist at psychology-glossary.com■■■■
Linguist: In the psychology context, a "linguist" does not have a direct definition because "linguist" . . . Read More
Alfred Adler at psychology-glossary.com■■■■
Alfred Adler) (1870-1937Major Works: Problems of Neurosis (1929), The Practice and Theory of Individual . . . Read More
Coffee table at top500.de■■■■
Coffee table id described as long, low table typically placed in front of a sofa. Ref: 123199/2006-09-19Other . . . Read More
Mosaic karyotypes at psychology-glossary.com■■■■
Mosaic karyotypes refers to the presence of both structurally normal and abnormal female chromosomes . . . Read More
Molecular cytogenic disorders at psychology-glossary.com■■■
Molecular cytogenic disorders refers to disorders or diseases related to chromosome abnormalities (extra, . . . Read More