Source:http://linkedlifedata.com/resource/umls/id/C0179847
UMD: Furniture consisting of a single seat with a back and with or without arms, specially designed for patient use (e.g., during examination, treatment, rehabilitation). Chairs are usually movable. Note: In definitions commonly found in dictionaries, a chair is a seat with a back that may include arms or not, and a stool is a seat without a back or arms; but it is a common practice in medical furniture literature to use "chair" when the furniture is designed for patient use and "stool" for the furniture typically used by the health personnel (physicians, nurses, dentists, etc.), regardless of whether it has a back rest or arms. This convention is used in the stool and chair terms.