Clinical Nurse Specialist, RN. After graduating from nursing school in Japan, I worked for two years in a large Tokyo hospital.
The definition of a stool is a seat without arms supported by three or four legs. An example of a stool is a seat that you'd sit on at a bar. Stool is the waste matter in a bowel movement. An example of stool is the source of the sample provided to a medical lab to check for stomach parasites. a piece of furniture for one person to sit on, typically having a round seat, three or four legs or a central post, and no back or arms.
Stool that is hard to pass, painful, or requires straining. Smooth and soft, formed into one long shape and not a bunch of pieces. Hard lumps and pieces, or mushy and watery, or even pasty and difficult to clean off. About one to two inches in diameter and up to 18 inches long.