| cursor | (noun) (computer science) indicator consisting of a movable spot of light (an icon) on a visual display; moving it allows the user to point to commands or screen positions | Synonyms: pointer |
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| precursor | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, harbinger, herald, predecessor |
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| (noun) a person who goes before or announces the coming of another | Synonyms: forerunner |
| (noun) a substance from which another substance is formed (especially by a metabolic reaction) | - |