TRISOMY 21

 Dictionary entry overview: What does trisomy 21 mean? 

• TRISOMY 21 (noun)
  The noun TRISOMY 21 has 1 sense:

1. a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation

  Familiarity information: TRISOMY 21 used as a noun is very rare.

 Dictionary entry details 

• TRISOMY 21 (noun)

Sense 1

Meaning:

A congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation

Classified under:

Nouns denoting stable states of affairs

Synonyms:

Down's syndrome; Down syndrome; mongolianism; mongolism; trisomy 21

Hypernyms ("trisomy 21" is a kind of...):

birth defect; congenital abnormality; congenital anomaly; congenital defect; congenital disorder (a defect that is present at birth)

trisomy (chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell)

 Context examples 

Also known as trisomy 21 syndrome.

(Down Syndrome, NCI Thesaurus)