mongolism, mongolianism, Down's syndrome, Down syndrome, trisomy 21(noun)
a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
Condition caused by a chromosomal excess, whereby the patients bear a certain resemblance to the Mongoloid race, such as a small head and tilted eyelids.
Origin: Named after John L.H. Langdon-Down (1828-1896), an English physician who described it in the late 1800s. The term was first used in 1961.
Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. Down syndrome is the most common chromosome abnormality in humans. It is typically associated with a delay in cognitive ability and physical growth, and a particular set of facial characteristics. The average IQ of young adults with Down syndrome is around 50, whereas young adults without the condition typically have an IQ of 100. A large proportion of individuals with Down syndrome have a severe degree of intellectual disability. Down syndrome is named after John Langdon Down, the British physician who described the syndrome in 1866. The condition was clinically described earlier by Jean Etienne Dominique Esquirol in 1838 and Edouard Seguin in 1844. Down syndrome was identified as a chromosome 21 trisomy by Dr. Jérôme Lejeune in 1959. Down syndrome can be identified in a newborn by direct observation or in a fetus by prenatal screening. Pregnancies with this diagnosis are often terminated. The CDC estimates that about one of every 691 babies born in the United States each year is born with Down syndrome.
U.S. National Library of Medicine
A chromosome disorder associated either with an extra chromosome 21 or an effective trisomy for chromosome 21. Clinical manifestations include hypotonia, short stature, brachycephaly, upslanting palpebral fissures, epicanthus, Brushfield spots on the iris, protruding tongue, small ears, short, broad hands, fifth finger clinodactyly, Simian crease, and moderate to severe MENTAL RETARDATION. Cardiac and gastrointestinal malformations, a marked increase in the incidence of LEUKEMIA, and the early onset of ALZHEIMER DISEASE are also associated with this condition. Pathologic features include the development of NEUROFIBRILLARY TANGLES in neurons and the deposition of AMYLOID BETA-PROTEIN, similar to the pathology of ALZHEIMER DISEASE. (Menkes, Textbook of Child Neurology, 5th ed, p213)
The numerical value of down syndrome in Chaldean Numerology is: 8
The numerical value of down syndrome in Pythagorean Numerology is: 7
Sample Sentences & Example Usage
I think it really normalizes Down syndrome and helps people see we are really like any other family.
I really appreciate Target putting them in their ads, i think it really normalizes Down syndrome and helps people see we are really like any other family.
Someone who is able to live a life of empathy and sympathy, and without agendas or guile, is someone we all want to know. It worked out for you, because of the person you are. i don’t know what the odds are of a woman born with Down syndrome marrying the love of her life.
I think it is time people realized that people with Down syndrome can be beautiful and should be celebrated, she is not insecure in the least bit, but I have made a point of never letting anyone be critical of her and telling her every day how amazing, funny, smart, beautiful, wonderful she is.
NDSS strongly condemns the use of the ‘r word,' as the leading human rights organization for all people with Down syndrome, we maintain a zero tolerance policy for this type of mockery and offense. All people with Down syndrome are valued members of society and deserve to be treated with the upmost dignity and respect.
Images & Illustrations of down syndrome
Find a translation for the down syndrome definition in other languages:
Select another language:
Discuss these down syndrome definitions with the community:
Word of the Day
Would you like us to send you a FREE new word definition delivered to your inbox daily?
Use the citation below to add this definition to your bibliography:
"down syndrome." Definitions.net. STANDS4 LLC, 2017. Web. 28 May 2017. <http://www.definitions.net/definition/down syndrome>.