Definitions for "Down syndrome"
A congenital disorder caused by an extra chromosome 21 in some or all cells. It causes a variable number and degree of abnormalities, including retarded growth, mental retardation, a short nose, prominent epicanthic folds on the eyelids, a protruding lower lip, and other physical features having varying degrees of deviation from the normal. Called also mongolism, trisomy-21 and trisomy 21 syndrome.
Chromosomal disorder characterized by moderate-to-severe mental retardation and by such physical signs as a downward-sloping skinfold at the inner corners of the eyes.
A genetic disorder characterized by some degree of mental retardation and by various physical malformations, such as slanted eyes and a broad face.
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