Williams syndrome

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A rare neurodevelopmental disorder characterized by a distinctive elfin facial appearance, developmental delay coupled with strong language skills, and cardiovascular problems.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a rare congenital disorder associated with deletion of genetic material in chromosome 7; characterized by mental deficiency and some growth deficiency and elfin faces but an overly social personality and a remarkable gift for vocabulary