bowel movement 
noun
1An act of defecation.Many people think that normal means having one bowel movement every day, but that's not always true....
- There are, however, several signs that a bowel movement is abnormal and should be discussed with a physician.
- Straining during a bowel movement increases pressure on the veins around the anus and can lead to hemorrhoids.
1.1The faeces discharged in an act of defecation.