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indicator medical definition
noun
- One that indicates, especially a pointer or an index.
- An instrument used to monitor the operation or condition of an engine, an electrical network, or another physical system; a meter or gauge.
- The needle, dial, or other registering device on such an instrument.
- Any of various substances, such as litmus or phenolphthalein, that indicate the presence, absence, or concentration of another substance or the degree of reaction between substances by means of a characteristic change, especially in color.
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