NOTE: This is the Professional Version. CONSUMERS: Click here for the Consumer Version. A bezoar is a tightly packed collection of partially digested or undigested material that is unable to exit the stomach. Gastric bezoars are usually rare and can occur in all age groups. They often occur in patients with behavior disorder or abnormal gastric emptying and also after gastric surgery.
verb (used without object), presided, presiding. 1. to occupy the place of authority or control, as in an assembly or meeting; act as president or chairperson. 2. to exercise management or control (usually followed by over): The lawyer presided over the estate. Origin of preside.
noun, plural chairmen. 1. the presiding officer of a meeting, committee, board, etc. 2. the administrative head of a department in a high school, college, or university. 3. someone employed to carry or wheel a person in a chair. verb (used with object), chairmaned or chairmanned, chairmaning or chairmanning.