[{"Bold_text": "noun", "List Items": ["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:Move the indicator to the edge of the browser and drag to resize the window.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 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.", "Ecology.a plant, animal, or species that indicates, by its presence in a given area, the existence of certain environmental conditions."]}]