Down, John Langdon H.(redirected from Down, John Langdon H)
Down,John Langdon H., English physician, 1828-1896.
Down syndrome - a chromosomal dysgenesis syndrome consisting of a variable constellation of abnormalities, caused by triplication or translocation of chromosome 21. Synonym(s): Langdon Down syndrome; trisomy 21 syndrome
Langdon Down syndrome - Synonym(s): Down syndrome