Indicator (Noun)
Meaning 1
A signal for attracting attention.
Classification
Nouns denoting communicative processes and contents.
Examples
- The flashing light on top of the police car was an indicator to other drivers to pull over.
- The brightly colored flags planted along the beach served as an indicator to warn swimmers of strong currents.
- The loud alarm was an indicator to the employees that the fire suppression system had been activated.
- The scent of freshly baked cookies wafting from the kitchen was an indicator to the kids that a snack was ready.
- The beeping sound coming from the satellite phone was an indicator to the expedition team that they had received a message.
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Meaning 2
A device for showing the operating condition of some system.
Classification
Nouns denoting man-made objects.
Hyponyms
Meaning 3
(chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction.
Classification
Nouns denoting substances.
Examples
- Litmus is an indicator that changes color in the presence of acid or base, making it useful for titration experiments.
- The phenolphthalein indicator was added to the solution, turning pink as soon as the acid had been completely neutralized.
- To determine if the chemical reaction had gone to completion, the scientist added an indicator to the mixture and observed the color change.
- A common indicator used to detect the presence of ammonia in water is bromothymol blue, which changes from yellow to blue when exposed to the compound.
- In this medical test, the presence of blood was detected using an indicator strip that changed color in response to the iron content.
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Meaning 4
A number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time.
Classification
Nouns denoting communicative processes and contents.