An order of BIRDS comprising the waterfowl, particularly DUCKS; GEESE; swans; and screamers.
I'm sorry for any confusion, but the term "geese" is a common name for certain species of waterfowl and doesn't have a medical definition. It is not related to medical terminology or healthcare.
"Ducks" is not a recognized medical term or condition in human health; it may refer to various anatomical structures in animals, such as the ducks of the heart valves, but it does not have a standalone medical definition.
Warm-blooded VERTEBRATES possessing FEATHERS and belonging to the class Aves.