| 单词 | indicator |
| 释义 | indicator /in"di kay'teuhr/, n. 1. a person or thing that indicates. 2. a pointing or directing device, as a pointer on the dial of an instrument to show pressure, temperature, speed, volume, or the like. 3. an instrument that indicates the condition of a machine or the like. 4. an instrument for measuring and recording variations of pressure in the cylinder of an engine. 5. Chem. a. a substance, as litmus, that indicates the presence or concentration of a certain constituent. b. a substance often used in a titration to indicate the point at which the reaction is complete. 6. Ecol. a plant or animal that indicates, by its presence in a given area, the existence of certain environmental conditions. [1660-70; < ML indicator, equiv. to L indica(re) to INDICATE + -tor -TOR] |
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