Danny DeVito, Oscar Award nominee and actor, is considered the world's most famous dwarf. He is said to be four feet, 10 inches.

A human dwarf is considered to be a grown person four feet, 10 inches, and under.

The distinguishing symptom of dwarfism is abnormally and significantly shorter physical stature with respect to other persons in the same age cohort, and especially in adults who have stopped growing. Many conditions that cause dwarfism also have other distinctive symptoms.

Dwarfism is typically a pathological condition in which the physical size of a person, animal, or plant is well below normal.

Famous dwarfs

Verne Troyer, actor and stunt man, famous for playing the character 'Mini-Me' in two Austin Powers movies.

Danny DeVito, Oscar Award-nominated producer, director, writer, and actor, is considered to be the most famous celebrity with dwarfism. He makes the cut at just 4'10".

Gary Coleman, former child actor.

- Additional source: http://en.wikipedia.org