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WordReference Random House Learner's Dictionary of American English © 2024sun•spot /ˈsʌnˌspɑt/USA pronunciation n. [countable]- Astronomya relatively dark patch that appears at certain times on the surface of the sun and affects magnetism on earth.
WordReference Random House Unabridged Dictionary of American English © 2024sun•spot (sun′spot′),USA pronunciation n. - Astronomyone of the relatively dark patches that appear periodically on the surface of the sun and affect terrestrial magnetism and certain other terrestrial phenomena.
sun′spot′ted, adj. sun′spot′ted•ness, n. Collins Concise English Dictionary © HarperCollins Publishers:: sunspot /ˈsʌnˌspɒt/ n - any of the dark cool patches, with a diameter of up to several thousand kilometres, that appear on the surface of the sun and last about a week. They occur in approximately 11-year cycles and possess a strong magnetic field
- informal a sunny holiday resort
- Austral a small cancerous spot produced by overexposure to the sun
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