- a person or thing that indicates, signals, or points out.
- a pointing or directing mechanism, as a pointer on the dial of an instrument to show pressure, temperature, speed, volume, etc., or a moveable icon in the graphical user interface of a computer or other device: The fuel indicator was pointing to empty.Move the indicator to the edge of the browser and drag to resize the window.
- an instrument that indicates the condition of a machine or the like.
- an instrument for measuring and recording variations of pressure in the cylinder of an engine.
- Chemistry.
- a substance, as litmus, that indicates the presence or concentration of a certain constituent.
- a substance often used in a titration to indicate the point at which the reaction is complete.
- a plant, animal, or species that indicates, by its presence in a given area, the existence of certain environmental conditions.
- something that provides an indication, esp of trends
- a device to attract attention, such as the pointer of a gauge or a warning lamp
- an instrument that displays certain operating conditions in a machine, such as a gauge showing temperature, speed, pressure, etc
- a device that records or registers something, such as the movements of a lift, or that shows information, such as arrival and departure times of trains
- (as modifier)
- a device for indicating that a motor vehicle is about to turn left or right, esp two pairs of lights that flash when operated or a pair of trafficators
- a delicate measuring instrument used to determine small differences in the height of mechanical components. It consists of a spring-loaded plunger that operates a pointer moving over a circular scale
- chem
- a substance used in titrations to indicate the completion of a chemical reaction, usually by a change of colour
- a substance, such as litmus, that indicates the presence of an acid or alkali
- Also called: indicator species ecology
- a plant or animal species that thrives only under particular environmental conditions and therefore indicates these conditions where it is found
- a species of plant or animal whose well-being confirms the well-being of other species in the area
