anus

"The patient followed the doctor's instructions carefully. "

"a low wall a low shelf"

"Andrew was ejected from his apartment for not paying the rent."

"The doctor asked about my alimentary habits to understand my stomach problems. "

"The dry-stone wall used a large, flat through to support the top stones. "

"The doctor ordered more tests to check for any abnormalities in the blood sample. "

"He examined the crime scene for clues."

"After eating a big bowl of beans, Michael's stomach discomfort was followed by noticeable flatus. "

"the orifice of an artery or vein;   the orifice of a wound;   the vagina and other orifices"

"By now, you must surely know which is which."

"If you still feel unwell tomorrow, see your doctor."

"The farmer used the canal to transport his crops to the market. "