The classic case is ketchup which will not come out of the bottle until you stress it by shaking.There are also fluids whose strain rate is a function of time. Fluids that require a gradually increasing shear stress to maintain a constant strain rate are referred to as rheopectic.
acute appendicitis. See APPENDICITIS. aÂ·cute apÂ·penÂ·diÂ·ciÂ·tis. Inflammation of the appendix, usually resulting from bacterial infection, which may be precipitated by obstruction of the lumen by a fecalith; symptoms include periumbilical colicky pain, vomiting, among others.
Appendicitis is inflammation of the appendix. It may be acute or chronic. In the United States, appendicitis is the most common cause of abdominal pain resulting in surgery. About 5 percent of Americans will experience appendicitis at some point in their lives. Appendicitis can happen at any time, but it occurs most often between the ages of 10 and 30. Itâs more common in males than in females. If left untreated, appendicitis may cause your appendix to burst and cause infection. This can be serious and sometimes fatal.