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.
Medical Definition of Acute. Acute: Of abrupt onset, in reference to a disease. Acute often also connotes an illness that is of short duration, rapidly progressive, and in need of urgent care. Acute is a measure of the time scale of a disease and is in contrast to subacute and chronic..