When a doctor uses the term elf-like facial features, is there a specific meaning?

Elf. Many genetic conditions have typical appearances. Elf-like facial features can describe someone with williams syndrome. They have small upturned noses, wide mouth, small teeth with wide spacing. They also have characteristic starburst appearance to their eyes, making them look like they are twinkling. While this description is used to easily describe without details, it does not make a diagnosis.
"Elfin" as a term. It's a term that's used to describe facial features of children with williams syndrome and some other syndromes. It's not really bad, it just means elf-like. Cute little turned-up nose with flattened bridge, wide mouth, puffiness under the eyes, etc; however, many parents of children with ws object to it, as do some doctors who specialize in this neurodevelopmental disorder.
Elf features. Williams syndrome (ws or wms; also williams–beuren syndrome or wbs) is a rare neurodevelopmental disorder characterized by a distinctive, "elfin" facial appearance, along with a low nasal bridge, an unusually cheerful demeanor and ease with strangers; developmental delay coupled with strong language skills; and cardiovascular problems, such as supravalvular aortic stenosis and transient hypercalca.
Elf-like features. Williams syndrome (ws or wms; also williams–beuren syndrome or wbs) is a rare neurodevelopmental disorder characterized by a distinctive, "elfin" facial appearance, along with a low nasal bridge, an unusually cheerful demeanor and ease with strangers; developmental delay coupled with strong language skills; and cardiovascular problems, such as supravalvular aortic stenosis and transient hypercalca.
Elf like face. The answer is yes and no. At times an elf-like face and other associated features and medical issues may suggest a genetic disorder. But at other times it can apply to an infant or child who is tiny and/or having petite facial features. Stating this, my daughter when she was young was slight and had elf like features. Over the course of many years her features changed but she is perfectly healthy.