Century Dictionary and Cyclopedia
- n. In astronomy, a luminous spot on the sun.
- n. astronomy A spot or fleck on the sun that is brighter than the surrounding surface.
GNU Webster's 1913
- n. (Astron.) A spot or fleck on the sun brighter than the surrounding surface.
- Diminutive from Latin lux, lucis, light. (Wiktionary)
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