|
Answer» A thing that indicates the state or level of something. a device PROVIDING specific information on the state or condition of something, in particular: a flashing light or (formerly) other device on a vehicle to show that it is about to CHANGE lanes or turn. a compound which changes colour at a specific PH value or in the presence of a particular substance, and can be used to monitor acidity, alkalinity, or the progress of a reaction. an animal or plant species which can be used to infer CONDITIONS in a particular habitat.
|